Complex sentence: It gained notoriety over the course of its long history, and was involved in the U.S. Supreme Court case "O'Connor v. Donaldson", in which the Court found that the hospital had illegally confined one of its patients.
Split into simpler sentences: It gained notoriety over the course of its long history. It was sued in "O'Connor v. Donaldson", a case that went to the US Supreme Court, which ruled that the hospital had illegally confined one of its patients.