Complex sentence: The West African College of Surgeons was founded in 1960 as an association of West African Surgeons and became a college in 1973 with 263 elected fellows.
Split into simpler sentences: The West African College of Surgeons is a college of West African Surgeon founded in 1960. It was an association of West African Surgeons before it became a college in 1973 with 263 elected fellows.