Complex sentence: Nasworthy spent the summer of 1970 in Northern Virginia on a family holiday; there he visited a plastics factory in Purcellville called "Creative Urethane", owned by a friend's father.
Split into simpler sentences: Nasworthy spent the summer of 1970 in Northern Virginia on a family holiday. There he visited a plastics factory in Purcellville called Creative Urethane, owned by a friend's father.