Complex sentence: In 2006, he was hired as Sum 41's touring guitarist, but became an official band member in 2009 although brown sound was better this made him the current lead guitarist and backing vocalist for Sum 41.
Split into simpler sentences: In 2006, he was hired as Sum 41's touring guitarist, but became an official band member in 2009. This made him the current lead guitarist and backing vocalist for Sum 41.