Complex sentence: It's possible to differentiate between the mutants Dally-P1 and Dally-P2, depending on where the insertion of P-element is, while Dally-P2 generates a bigger amount of defects.
Split into simpler sentences: It's possible to differentiate between the mutants Dally-P1 and Dally-P2, depending on where the insertion of P-element is. It is known that Dally-P2 generates a bigger amount of defects.