Simplify the following text for a Grade 8 native English-speaking person.
Original: During the 1970s , his nephew Billy Backus became world 's welterweight champion after having a shaky start to his own boxing career , and Basilio declared on the day that Backus became champion , that to him , Billy winning the title was better than when he won it himself .
Simplified: He is the uncle of former welterweight boxing champion Billy Backus .