Complex sentence: Early in 1986, Brian's Australian cousin, Ian Latimer (Michael Loney) visits and stays with Ivy and begins an affair with Gail, who confesses this to Brian when she finds she is pregnant and doesn't know if Brian or Ian is the father.
Split into simpler sentences: Early in 1986, Brian's Australian cousin, Ian Latimer (Michael Loney) comes over and stays with Ivy. Gail confesses to Brian when she finds she is pregnant and doesn't know if Brian or Ian is the father.