Complex sentence: Zachary Gray and Tom Dobrzanski began their musical careers in the British Columbia Boys'Choir, and together they started writing simple guitar and piano songs, and recording them on Zach's father's 4-track player.
Split into simpler sentences: Zachary Gray and Tom Dobrzanski began their musical careers in the British Columbia Boys'Choir. Together they started writing simple guitar and piano songs, and recording them on Gray's father's 4-track player.