Nested If / Question about a logic

Good Day Experts,

I would like to write a if condition which check parameters before filling one cell. If one condition is wrong the check should stop.
In one data record the check will do the following:
1. Check if B3=5 then continue and check if C3= true then continue and check if D3>=31.10.2011 write "pass" in cell G3.
2. Check if B4=5 then continue and check if C4= true then continue and check if D4>=31.10.2011 if not, check if E4>D4 and check if F4>=D4 write "pass" in cell G4. otherwise "fail" and copy the F4 value into D4.
3. Check if B5=1 write "fail" in cell G5.
4. Check if B6=5 then continue and check if C6= true then continue, if not, write "fail" in cell G6.

The sample is attached.

Could you please help me on that way?

Thank you in advance