Complex sentence: In most instances, the victims ran into a verge and survived and their experiences remained a local curiosity, but in June 1921, Dr. E.H. Helby, the medical officer for Dartmoor Prison was killed when he lost control of his motorcycle combination.
Split into simpler sentences: In most instances, the victims ran into a verge and survived. Their experiences remained a local curiosity, until June 1921, when Dr. E.H. Helby, the medical officer for Dartmoor Prison was killed when he lost control of his motorcycle combination.