Complex sentence: It had been a fairly complicated affair to bring about various leaders of civil rights, religious and labor groups, as the name of the march tells us, many compromises had to be done to united people fighting in so many different causes.
Split into simpler sentences: It had been a fairly complicated affair to bring together various leaders of civil rights, religious and labor groups. As the name of the march tells us, many compromises had to be made in order to unite the followers of so many different causes.