Complex sentence: In 2010, the original Executive Director, Brett Flater, left the LAMDL, to be replaced by former debater Cameron Ward, a coach and volunteer in Urban Debate Leagues since 2000.
Split into simpler sentences: In 2010, the original Executive Director, Brett Flater, was replaced with former debater Cameron Ward. Ward has been working as a coach and volunteer in Urban Debate Leagues since 2000.