Complex sentence: He has a chance meeting with Irish-American veteran officer Jimmy Malone (Connery), who is fed up with the rampant corruption and offers to help Ness, suggesting that they find a man from the police academy who has not come under Capone's influence.
Split into simpler sentences: He has a chance meeting with Irish-American veteran officer Jimmy Malone (Connery). Fed up with the rampant corruption, Malone decides to work with Ness and suggests they enlist someone from the police academy who has not come under Capone's influence.