Summing the result of nested IF statements in one cell

I've got a pretty complex conditional formula that works for each row of a column (sorry, no excel 2016 IFS) and I would like to get the sum of all instances in a range in one formula without having to make all the rows as a middle step.

Done this quite a bit with other stuff, but for some reason I'm stuck on this one.

The formula per cell is:

=IF((IF(IF(AND(ISNUMBER(Test_Samples!B2),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<1),0,IF(IF(IF(AND(ISNUMBER(Test_Samples!B2),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<2,1,IF(IF(IF(AND(ISNUMBER(Test_Samples!B182),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<5,2,IF(IF(IF(AND(ISNUMBER(Test_Samples!B2),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<13,3,IF(IF(IF(AND(ISNUMBER(Test_Samples!B2),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<34,4,IF(IF(IF(AND(ISNUMBER(Test_Samples!B2),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<91,5,IF(IF(IF(AND(ISNUMBER(Test_Samples!B2),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<245,6,IF(IF(IF(AND(ISNUMBER(Test_Samples!B2),Test_Samples!B2>0.1),Reference_Dataset!$H:$H,"")="N",Test_Samples!B2,0)<666,7,))))))))

I would like to transform it to a formula that sums everything from the range B:B (or B2:B499) in one go.

I tried some SUM and SUMIF(S) stuff and changing B2 to B:B. That doesn't seem to work.

Oh, if someone has a tip to reduce the nested IF formula to something more readable, that's welcome as well. The idea of the formula is to transform counts to classes.