Complex sentence: Patch 1.9 was released on March 18,2013, in addition to providing various bug fixes, this patch also added new features, most namely the new'Legendary' difficulty and'Legendary' skills.
Split into simpler sentences: Patch 1.9 was released on March 18,2013. In addition to providing various bug fixes, this patch also added new features, most namely the new'Legendary' difficulty and'Legendary' skills.