C# multiple branches with if & else statement. errors in Logic || syntax

using System;
namespace Console game
{
    public class LookCommand : Command
    {
        public LookCommand(string[] idents):base(idents)
        { 

        }

        public override string Execute(Player p, string[] text)
        {
            /// <summary>
            /// Trial 1
            /// </summary>
            /// <returns>The container.</returns>
            /// <param name="p">P.</param>
            /// <param name="ContainerId">Container identifier.</param>
                if (text.Length == 3 || text.Length == 5)
                {
                    if (text[0] == "look")
                    {
                        if (text[1] == "at")
                        {
                            if (text.Length == 5)
                            {
                                if (text[3] == "in")
                                {
                                    IHaveInventery container = FetchContainer(p, text[4]);
                                    if (container != null)
                                    {
                                        if (container.locate(text[2]) != null)
                                        {
                                            return LookAtIn(text[2], container);
                                        }
                                        else
                                        {
                                            return "I can't find<<" + text[2] + ">> in <<" + text[4] + ">>";
                                        }
                                    }
                                }
                                else
                                {
                                    return "what do you want to look in ?";
                                }
                            }
                             if(text.Length == 3)
                            {
                                IHaveInventery container = p as IHaveInventery;
                                return LookAtIn(text[2], container);
                            }
                            else
                            {
                                return "I can't find<<" + text[2] + ">>";
                            }
                        }
                        else
                        {
                            return "What do you want to look at ?";
                        }
                    }
                    else
                    {
                        return "Error in look input";
                    }
                }
                else
                {
                    return "I don't know how to look at that !";
                }
            }           
        private IHaveInventery FetchContainer(Player p, string ContainerId)
        {
            return p.Locate(ContainerId) as IHaveInventery;
        }

        private string LookAtIn(string thingId, IHaveInventery Container)
        {
            return Container.locate(thingId).FullDescription;
        }

    }
}

I am beginner of programming there must be syntax or logic error occurred. They would not past the Unittest. Error