Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1914 Casals married the American socialite and singer Susan Metcalfe ; they were separated in 1928 , but did not divorce until 1957 .
Simplified: In 1914 Casals married the American singer Susan Metcalfe . They were separated in 1928 , but did not divorce until 1957 .