I am trying to decode a complicated excel formula left to me by a former colleague. Can someone help me decipher this?

=IF(F6="N/A",$Y$4,((IF(STANDARDIZE(F6,Mean Fresh_ret_rate,StdDev Fresh_ret_rate)<0,(StdDevLow Fresh_ret_rate*-1)-(STANDARDIZE(F6,Mean Fresh_ret_rate,StdDev Fresh_ret_rate)*-1),IF(STANDARDIZE(F6,Mean Fresh_ret_rate,StdDev Fresh_ret_rate)>0,(StdDevLow Fresh_ret_rate*-1)+STANDARDIZE(F6,Mean Fresh_ret_rate,StdDev Fresh_ret_rate),0)))/StdDevRange Fresh_ret_rate)*Weight Fresh_ret_rate)