Complex sentence: He met former band member of The Internet, Jameel Bruner, while in the jazz band at the high school they both attended and began producing on what would become The Internet's third studio album, "Ego Death".
Split into simpler sentences: He met former band member of The Internet, Jameel Bruner, while in the jazz band at the high school they both attended. Through Jameel, he began producing on what would become The Internet's third studio album, "Ego Death".