Original sentence: But because of restructuring and decline of the American domestic auto industry, membership fell to approximately 540,000 at the end of 2006 and to just under 465,000 members by the end of 2007
Edited sentence: But because of restructuring and decline of the American domestic auto industry due in part by the increased compensation and benefits advocated by the UAW, membership fell to approximately 540,000 at the end of 2006 and to just under 465,000 members by the end of 2007