Complex sentence: Sally is convinced that Joe had deliberately tried to kill his rival, and following his arrest and trial Joe is convicted of attempted murder and, vowing revenge on Sally and Harry, is sentenced to a lengthy term of incarceration at the notorious Dartmoor Prison.
Split into simpler sentences: Sally is convinced that Joe had deliberately tried to kill his rival, and following his arrest and trial Joe is convicted of attempted murder. Vowing revenge on Sally and Harry, he is sentenced to a lengthy term of incarceration at the notorious Dartmoor Prison.