Complex sentence: John Thomas Sweeney (born 1956) was sous-chef at the restaurant Ma Maison and dated American actress Dominique Dunne in 1982 and killed her by strangulation after a domestic dispute on October 30,1982.
Split into simpler sentences: John Thomas Sweeney (born 1956) was sous-chef at the restaurant Ma Maison. He dated American actress Dominique Dunne in 1982 and killed her by strangulation after a domestic dispute on October 30,1982.