Complex sentence: To help maintain Green Line service until the Type 8s were expected to be in service, in 1997 the MBTA took delivery of an additional 20 Type 7s from Kinki Sharyo, and contracted with Amerail of Hornell, NY to completely rehabilitate 55 LRVs for extended service.
Split into simpler sentences: To help maintain Green Line service until the Type 8s were expected to be in service, in 1997 the MBTA took delivery of an additional 20 Type 7s from Kinki Sharyo. Additionally, the MBTA contracted with Amerail of Hornell, NY to completely rehabilitate 55 LRVs for extended service.