Selected Answer
This question is almost identical to the one you asked the other day. You ought to have been able to construct the formula yourself based on the answer you already had. Here is the formula.
=IF(AND(INDEX(Master!$E:$E,MATCH($A4,Master!$B:$B,0))=$E4,INDEX(Master!$F:$F,MATCH($A4,Master!$B:$B,0))=$F4,INDEX(Master!$G:$G,MATCH($A4,Master!$B:$B,0))=$G4),"","Changed")
However, I think you are constructing your work flow the wrong way. You will need to paste the formula into column H of the imported data sheet every time. Why not have a formula in column L of your Master which checks for changes in "Sheet2". When you change Sheet2 the changes will be highlighted in the Master (you could even use CF to actually highlight them). The formula below will show a result like "Changed (13)" where 13 is the row number in Sheet2 where the change can be found.
=IFERROR(IF(AND(INDEX(Sheet2!$E:$E,MATCH($B3,Sheet2!$A:$A,0))=$E3,INDEX(Sheet2!$F:$F,MATCH($B3,Sheet2!$A:$A,0))=$F3,INDEX(Sheet2!$G:$G,MATCH($B3,Sheet2!$A:$A,0))=$G3),"","Changed ("&MATCH($B3,Sheet2!$A:$A,0)&")"),"")
If the number in B2 is not found in Sheet2 or if it is found and there is no change the cell will remain blank.
If you wish to highlight the changed item use H2<>"" as the criterium, meaning, if H2 <> "" it should be coloured to draw your attention. If you apply the rule to all cells, the entire row could be highlighted depending on the contents of column H.