Complex sentence: Marianne Dickerson (born November 14,1960 in St. Joseph, Illinois) is a retired female long-distance runner from the United States, who won the silver medal at the 1983 World Championships in Helsinki, Finland.
Split into simpler sentences: Marianne Dickerson (born November 14,1960 in St. Joseph, Illinois) was a female long-distance runner from the United States. Dickerson won the silver medal at the 1983 World Championships in Helsinki, Finland.