Simplify the following text for a Grade 8 native English-speaking person.
Original: In July 1977 , Warsaw recorded a set of five demo tracks at Pennine Sound Studios , Oldham . Uneasy with Brotherdale 's aggressive personality , the band fired him soon after the demo sessions .
Simplified: Warsaw made a demo tape with five songs in the Pennine Sound Studios in July , but Brotherdale quit the group a few days later .