Simplify the following text for a Grade 8 native English-speaking person.
Original: They re-formed at events such as Live Aid and for reunion tours such as their 25th anniversary tour ( 1989 ) and the Quadrophenia tours of 1996 and 1997 .
Simplified: They re-formed at events such as Live Aid and for reunion tours such as their 25th anniversary tour and the Quadrophenia tours of 1996 and 1997 .