Complex sentence: The squadron gained early fame with its involvement in the Battle of Taranto in 1940, when the Italian Battlefleet in harbour at Taranto was raided; which redefined the use of air power from the sea.
Split into simpler sentences: The squadron gained early fame with its involvement in the Battle of Taranto in 1940. The battle consisted of a raid on the Italian Battlefleet in harbour at Taranto which redefined the use of air power from the sea.