Optimizing nested If statements and conditions

Say I have three conditions, represented by Boolean variables. How do I make the following blocks of code simpler?

bool condition1, condition2, condition3; //assuming they already have values

if (condition1 && condition2)
{
    if (condition3)
    {
        //Few lines of code here
    }
}
else
{
    //Same few lines of code above here
}

Is there a better/neater way of simplifying this, aside from putting the 'lines of code' in a method? Can the inner if be removed? Thanks.