Complex sentence: During the Second World War, its use was restricted after 1942 when the replacments 5.5 inch gun came into use and it was declared obsolete with the end of the war in 1945.
Split into simpler sentences: During the Second World War, its use was restricted after 1942 when the replacments 5.5 inch gun came into use. It was declared obsolete with the end of the war in 1945.