Complex sentence: He is still in love with his ex-girlfriend, Karen, who is about to be married to her fiancé, Bill Lewis, and with whom Hank shares custody of their 12-year-old daughter, Becca.
Split into simpler sentences: He is still in love with his ex-girlfriend, Karen, who is about to be married to her fiancé, Bill Lewis. They share custody of a 12-year-old daughter, Becca.