Complex sentence: On 6 March the German battleship put to sea and was sighted by a British submarine around 19:40; no contact was made, however, except for an unsuccessful aerial torpedo attack by aircraft from "Victorious".
Split into simpler sentences: On 6 March the German battleship put to sea and was sighted by a British submarine around 19:40. No contact was made except for an unsuccessful aerial torpedo attack by aircraft from "Victorious".