Simplify the following text for a Grade 8 native English-speaking person.
Original: In 1857 , at the age of 18 , Sisley was sent to London to study for a career in business , but he abandoned it after four years and returned to Paris in 1861 .
Simplified: In 1857 , at the age of 18 , Sisley was sent to London to study for a career in business , but he gave it up after four years and returned to Paris .