A California court unsealed a lawsuit filed by a former Playboy centerfold claiming that a GOP fundraiser reneged on a 2017 agreement to pay her $1.6 million to keep quiet about an affair and pregnancy.

The unsealing of the complaint Tuesday in Los Angeles County Superior Court sheds more light on the $1.6 million deal between Shera Bechard and Elliott Broidy, who has acknowledged their affair and subsequent agreement. It also shows how the agreement grew out of an existing relationship between Ms. Bechard’s lawyer and Michael...