Complex sentence: Marie Dressler, another former chorus girl who had gone on to be a major star on the stage, was elected the associations first president and she led them to join the strike, spearheading a march down Broadway in solidarity with Actors' Equity.
Split into simpler sentences: Marie Dressler, another former chorus girl who had gone on to be a major star on the stage, was elected the association's first president. She led them to join the strike, spearheading a march down Broadway in solidarity with Actors' Equity.