Complex sentence: On a visit to Port Blair's prison, however, Lord Mayo was assassinated, stabbed to death by Sher Ali, a Pathan life convict, thus becoming the only Indian Viceroy to be murdered in office.
Split into simpler sentences: On a visit to Port Blair's prison, however, Lord Mayo's life was cut short. He was assassinated, stabbed to death by Sher Ali, a Pathan life convict, thus becoming the only Indian Viceroy to be murdered in office.