Simplify the following text for a Grade 10 native English-speaking person.
Original: In their teens they participated in a number of amateur bands ; however , it was not until 1986 when Marcus was invited to Mike 's band that Boards of Canada was born .
Simplified: In their teens they went in a number of amateur bands ; however , it was not until 1986 when Marcus was invited to Mike 's band that Boards of Canada was born .