Complex sentence: Before he can attack the BFG, an army helicopter ensnares him and the giants are lifted away onto an isolated uncharted island where numerous crates of snozzcumber seeds are left with them, much to their fury.
Split into simpler sentences: Before he can attack the BFG, an army helicopter ensnares him and the giants are lifted away. The giants are all trapped on an isolated uncharted island where numerous crates of snozzcumber seeds are left with them much to their fury.