Complex sentence: Workers there contacted the Teamsters Local 653 in the Spring of that year and got signatures from about 75% of the workplace in support of the union, which was well over enough to call for a vote by NLRB regulations.
Split into simpler sentences: Workers there contacted the Teamsters Local 653 in the Spring of that year and got signatures from about 75% of the workplace in support of the union. Well over enough to call for a vote by NLRB regulations.