Complex sentence: To avoid possible damage to the port and other ships in the harbour, the badly damaged "Glatton" was sunk by torpedoes, two fired from HMS "Cossack" and two from HMS "Myngs".
Split into simpler sentences: To avoid possible damage to the port and other ships in the harbour, the badly damaged "Glatton" was sunk by torpedoes. Two from HMS "Cossack" and two from HMS "Myngs".