Simplify the following text for a Grade 10 native English-speaking person.
Original: Cleveland won the AFC Central Division in 1989 ; however , for the third time in four years , the Browns losing to John Elway 's Denver Broncos in the conference championship game 37-21 .
Simplified: Cleveland won the AFC Central Division in 1989 before losing to the Denver Broncos in the conference championship for the third time in four years .