Complex sentence: Its major effort was passage of the Equal Rights Amendment (ERA) to the United States Constitution, but it was defeated by anti-feminists led by Phyllis Schlafly, who objected that the ERA meant women would be drafted into the military.
Split into simpler sentences: Its major effort was passage of the Equal Rights Amendment (ERA) to the United States Constitution. They were defeated by anti-feminists led by Phyllis Schlafly, who argued that the ERA meant women would be drafted into the military.