Complex sentence: What they fail to realise is Des's master plan to form the' perfect crime' and steal valuable diamonds from fellow inmate and notorious bully Benny and takes petty theft criminal Phil under his wing to hatch the devious and dangerous plan.
Split into simpler sentences: What they fail to realise is Des's master plan to form the' perfect crime' and steal valuable diamonds from fellow inmate and notorious bully Benny. He takes petty theft criminal Phil under his wing to hatch the devious and dangerous plan.