Complex sentence: He gives him the money from the drug deal and as he leaves the building, is confronted by Richard who apologises for his rude behaviour, saying that he didn't know what came over him and that he's truly sorry.
Split into simpler sentences: He gives him the money from the drug deal and as he leaves the building, is confronted by Richard. He apologises for his rude behaviour, saying didn't know what came over him and that hes truly sorry.