Complex sentence: Tyrone was a 17-year-old boy from Boston, Massachusetts with a debilitating stutter and ran away to New York City when his speech impediment prevented him from stopping his friend from stepping in front of a moving vehicle.
Split into simpler sentences: Tyrone was a 17-year-old boy from Boston, Massachusetts, with a debilitating stutter. He ran away to New York City when his speech impediment prevented him from stopping his friend from stepping in front of a moving vehicle.