Complex sentence: Bernie LaPlante (Dustin Hoffman) is a pickpocket and petty criminal who anonymously rescues survivors including TV reporter Gale Gayley (Geena Davis) at an aircraft crash, in order to steal some of their purses and wallets, losing a shoe in the process.
Split into simpler sentences: Bernie LaPlante (Dustin Hoffman) is a pickpocket and petty criminal who anonymously rescues survivors including TV reporter Gale Gayley (Geena Davis) at an aircraft crash. His motives are not "pure" as he enters the burning airliner in order to steal some of the passenger's purses and wallets, losing a shoe in the process.