Complex sentence: In 1993, Norquist launched his Wednesday Meetings series at ATR headquarters, initially to help fight President Clinton's healthcare plan and eventually becoming one of the most significant institutions in American conservative political organizing.
Split into simpler sentences: In 1993, Norquist launched his Wednesday Meeting series at ATR headquarters, initially to help fight President Clinton's healthcare plan. The meeting eventually became one of the most significant institutions in American conservative political organizing.