Complex sentence: He is most famous for his marriage to the actress Merle Oberon in 1975; after Oberon died in 1979, Wolders became the companion of Audrey Hepburn until her death in 1993.
Split into simpler sentences: He is most famous for his marriage to famed actress Merle Oberon in 1975. After she died in 1979, Wolders became the companion of Audrey Hepburn until her death in 1993.