Complex sentence: In 2012, Walters created a side channel on which he posted various vlogs, and in June 2015, he collaborated with Panic! at the Disco vocalist Brendon Urie both on this channel and through Transmitter.
Split into simpler sentences: In 2012, he created a side channel on which he posted various vlogs. In June 2015, Walters collaborated with Panic! at the Disco vocalist Brendon Urie both on this channel and through Transmitter.