Simplify the following text for a Grade 10 native English-speaking person.
Original: His first single was the little-known `` When You Gonna , '' released as a collaboration with Lisa Carter , but his first solo offering was `` Never Gonna Give You Up , '' released in 1987 which spent five weeks at the top of the British charts and becoming the year 's highest-selling single .
Simplified: His first single was the little-known `` When You Gonna '' , released as a collaboration with Lisa Carter , with little promotion .