Complex sentence: After a brief relationship with Hugh Hefner (which coincided with her Playmate appearances and being named 1982 Playmate of the Year), Tweed has lived with Simmons since 1983, who explained in a 2011 interview I need Shannon in my life.
Split into simpler sentences: After a brief relationship with Hugh Hefner (which coincided with her Playmate appearances and being named 1982 Playmate of the Year), Tweed has been in a relationship with Gene Simmons since 1983. Simmons explained in a 2011 interview, I need Shannon in my life.