Complex sentence: His first term in office was also marked by the beginning of an unchecked period of gentrification throughout the city, with many longtime residents being priced out of their homes and neighborhoods and subsequently migrating to neighboring Prince George's County, Maryland.
Split into simpler sentences: His first term in office was marked by the beginning of a period of gentrification throughout the city. Longtime residents complained of being priced out of their homes and neighborhoods and forced to move to neighboring Prince George's County, Maryland.