Complex sentence: Johnson defended the Flyweight title seven times before moving up in weight to win the IBF Super Flyweight title in 1999 via unanimous decision over Ratanachai Vor Vorapin.
Split into simpler sentences: Johnson defended the Flyweight title seven times. He moved up in weight to win the IBF Super Flyweight title in 1999 via unanimous decision over Ratanachai Vor Vorapin.