Complex sentence: In 1989, he had to sell successful businesses including Pergamon Press to cover some his debts, and in 1991 his body was discovered floating in the Atlantic Ocean having fallen overboard from his yacht.
Split into simpler sentences: In 1989, he had to sell successful businesses including Pergamon Press to cover some of his debts. In 1991, his body was discovered floating in the Atlantic Ocean having fallen overboard from his yacht.