Complex sentence: Seth fell off his bike and paramedics rushed to his aid and an emergency helicopter lifted him to nearby hospital, where the doctors cut him ear to ear, pulled his forehead down and inserted 2 titanium plates to replace his crushed part of his cranium.
Split into simpler sentences: Seth fell off his bike and paramedics rushed to his aid. An emergency helicopter lifted him to a nearby hospital where the doctors cut him ear to ear, pulled his forehead down and inserted two titanium plates to replace his crushed part of his cranium.