Complex sentence: While Stein was looking for it the MP became impatient and asked him to hurry up before grabbing his pass and arresting him at which the Australians began swearing at the MP telling him to leave Stein alone.
Split into simpler sentences: While Stein was looking for it, the MP became impatient and asked him to hurry up before grabbing his pass and arresting him. At this the Australians began swearing at the MP and telling him to leave Stein alone.