Complex sentence: On December 29,2009, they released their debut, self-titled album and began touring Ohio, which was followed by their second album, "Regional at Best" in 2011, which consisted only of Joseph and Dun.
Split into simpler sentences: On December 29,2009, they released their debut, self-titled album and began touring Ohio. Followed by their second album, "Regional at Best" in 2011, which consisted only of Joseph and Dun.