Complex sentence: Waronker and CBD were active members of the Builders League of South Jersey, where Waronker chaired subcommittees, eventually rising to the executive committee, and then became the only two term BLSJ President in 1999-2001.
Split into simpler sentences: Waronker and CBD were active members of the Builders League of South Jersey, where Waronker chaired subcommittees, eventually rising to the executive committee. Waronker then became the only two-term BLSJ President, in 1999-2001.