Complex sentence: The 8th Submarine Squadron of the Imperial Japanese Navy was based at Palau Jerejak, Penang, Malaya until late 1944 during World War II. Its mission was to disrupt Allied supply lines in aid of Nazi Germany.
Split into simpler sentences: The 8th Submarine Squadron of the Imperial Japanese Navy was based at Palau Jerejak, Penang, Malaya until late 1944 during World War 2. Its purpose was to disrupt Allied supply lines in aid of Nazi Germany.