Yeah, I ever see formula of my friend and just watch it alone, it can make my head hurts.
But I have the solution of that problem, this solution can make you see the formula easier than before and if you are a mathematical and need to create formula that long, it can be helpful to you.
The key is you need to press [ALT] + [Enter] between the code
This example show you that I have formula and even though it didn't that long. But it still pretty annoying if you focused on another field and then read this formula again
"=IF($A1=0,0,IF($B1<4264,0,IF(AND($B1>=4264,$B1<=4895),(-22.31*$C1/365),IF(AND($B1>=4895,$B1<=32760),($B1*0.093-476.89)*$C1/365,IF($B1>32760,($B1*0.128-1623.49)*$C1/365)))))"
With [ALT] + [Enter], you can separate it to be like this
"=IF($A1=0,0,
IF($B1<4264,0,
IF(AND($B1>=4264,$B1<=4895),(-22.31*$C1/365),
IF(AND($B1>=4895,$B1<=32760),($B1*0.093-476.89)*$C1/365,
IF($B1>32760,($B1*0.128-1623.49)*$C1/365)))))"
It become 5 line but it better than before.
Do you agree with me?