Complex sentence: As the 1970's ushered in, Steve and Alice had finally married in September 1971 which lasted into mid 1973, and still faced most of the problems that were keeping them apart after their marriage crumbled.
Split into simpler sentences: As the 1970's ushered in, Steve and Alice had finally married in September 1971. Their marriage lasted into mid 1973, and still faced most of the problems that were keeping them apart after their marriage crumbled.