Complex sentence: On 25 June, the British submarine torpedoed and sank the French submarine "Souffleur" off the Syrian coast; shortly afterward, the French tanker "Adour" was attacked by British torpedo aircraft.
Split into simpler sentences: On 25 June, the British submarine torpedoed and sank the French submarine "Souffleur" off the Syrian coast. Shortly afterward, the French tanker "Adour" was attacked by British torpedo aircraft.