Complex sentence: He had served as Vice-Chairman for the Tax Increment Reinvestment Zone or TIRZ since its inception, and he has also represented them at the board at the Downtown Amarillo Inc. meetings since their beginning.
Split into simpler sentences: He had served as an Amarillo City Commissioner from 2005-2007 He had served as Vice-Chairman for the Tax Increment Reinvestment Zone or TIRZ since its inception. He has represented the TIRZ board at the Downtown Amarillo Inc. meetings since their beginning.