Original sentence: The Main Line is an unofficial historical and socio-cultural region of suburban Philadelphia, Pennsylvania, comprising a collection of affluent towns built along the old Main Line of the Pennsylvania Railroad which ran northwest from  downtown Philadelphia parallel to Lancaster Avenue (US Route 30), a road originally built in 1792 as part of the Philadelphia and Lancaster Turnpike and designated as a portion of the "Lincoln Highway" when that transcontinental highway system was established in 1913
Edited sentence: The Main Line is an unofficial historical and socio-cultural region of suburban Philadelphia, Pennsylvania, comprising a collection of affluent towns built along the old Main Line of the Pennsylvania Railroad which ran northwest from  downtown Philadelphia parallel to Lancaster Avenue (US Route 30).The Main Line is widely considered to be a bastion of "old money" and one of the most exclusive, affluent and highly educated areas in the country