Complex sentence: Doylestown had long been respected as a bucolic tourist destination; the gentry of Philadelphia and New York frequently maintained country estates in the area, and the stars of the Manhattan theatre and literary scenes often summered there.
Split into simpler sentences: Doylestown had long been respected as a bucolic tourist destination. The gentry of Philadelphia and New York maintained country estates in the area while the stars of the Manhattan theater, and the literary scene, often summered there.