Complex sentence: Run DMT was previously a duo, consisting of Robbins and Chris Parson, until Parson as heard from rumors, got high on bath-salts, resulting in a massive fight between the duo, and left the group in July 2012.
Split into simpler sentences: Run DMT was previously a duo, consisting of Robbins and Chris Parson, until Parson left the group. Some rumors claim Parson got high on bath-salts, resulting in a massive fight between the duo, where Parson then chose to leave the group in July 2012.