Simplify the following text for a Grade 9 native English-speaking person.
Original: The other musicians in his band were Otto Hardwick , on bass and then saxophone ; Arthur Whetsol on trumpet ; Elmer Snowden on banjo ; and Sonny Greer on drums .
Simplified: The band included Otto Hardwick , who switched from bass to saxophone ; Arthur Whetsol on trumpet ; Elmer Snowden on banjo ; and Sonny Greer on drums .