Complex sentence: At one point the Club was strictly a boys club and did not have any openings for female members but changed to include both boys and girls about half way through its life and no longer discriminates between the genders.
Split into simpler sentences: At one point the Club was strictly a boys club and did not have any openings for female members. That was eventually changed to include both boys and girls about half way through its life and no longer discriminates between the genders.