Complex sentence: In the mid 1990s efforts were made to promote marriage as part of the emerging marriage movement, with 1996 being a significant year as Congress reforms were passed concerning the welfare system in regards to unmarried births and decline in marriage.
Split into simpler sentences: In the mid 1990s efforts were made to promote marriage as part of the emerging marriage movement. Most significant was 1996,in which congressional reforms were passed concerning the welfare system in regards to unmarried births and decline in marriage.