Complex sentence: Operating in conjunction with No.25 Squadron No.14 Squadron began flying patrols over the Indian Ocean and West Australian coastline following the outbreak of war in September 1939 and provided anti-submarine escort for the convoys carrying Australian troops to the Middle East during 1940 and 1941.
Split into simpler sentences: Operating in conjunction with No.25 Squadron, No.14 Squadron began flying patrols over the Indian Ocean and West Australian coastline following the outbreak of war in September 1939. In this role the Squadron provided anti-submarine escort for the convoys carrying Australian troops to the Middle East during 1940 and 1941.