Complex sentence: A number of the outer buildings were in use by businesses as recently as 2007; however, in 2010, after renting space in the plant for over 52 years, the last tenant, Chemical Processing, left in favor of nearby suburban Madison Heights.
Split into simpler sentences: A number of the outer buildings were in use by businesses as recently as 2007. However in 2010 after renting space in the plant for over 52 years the last tenant, Chemical Processing, left in favor of nearby suburban Madison Heights.