Complex sentence: His marriage to Liza Minnelli ended in divorce; he subsequently proclaimed his homosexuality and publicly entered a relationship with Gregory Connell that lasted until Connell's death, 15 years later.
Split into simpler sentences: His marriage to Liza Minnelli ended in divorce, and culminated his heterosexual guise. He subsequently proclaimed his homosexuality and publicly entered a relationship with Gregory Connell that lasted until Connell's death, 15 years later.