Can someone explain this Costner/Baldwin case in English?

NEW ORLEANS (CN) - Stephen Baldwin has sued Kevin Costner, claiming Costner and others tricked him into selling his shares in a company whose technology separates oil from water. Baldwin and a co-plaintiff claim that Costner and associates made a lucrative deal with BP after the Deepwater Horizon oil spill, then bought out the plaintiffs' shares while keeping them in the dark about the $52 million sale to BP.