Complex sentence: Radar then enters the room to tell Frank that he has a phone call from someone in the States which turns out to be Frank's mother and tells her of the 4077 MASH's hatred to him and that Houlihan tricked Frank into falling in love with her.
Split into simpler sentences: Radar then enters the room to tell Frank that he has a phone call from someone in the States. It turns out to be Frank's mother and he tells her of the 4077 MASH's hatred to him and that Houlihan tricked Frank into falling in love with her.