Simplify the following text for a Grade 7 native English-speaking person.
Original: He received piano and guitar lessons and often performed with his brother Dik Evans before they both answered an advertisement posted by Larry Mullen , Jr. at their school , Mount Temple Comprehensive School , seeking musicians to form a band .
Simplified: He received piano and guitar lessons with his brother , Dik Evans . At Mount Temple Comprehensive School , they both answered an advertisement posted by Larry Mullen , Jr. wanting musicians to form a band .