Original:  British rule was suspended in February 1942, when the Imperial Japanese Army of the Japanese Empire had invaded Singapore during the Pacific Front of World War II and renamed it Syonan-to . After the war, Singapore was returned to British rule.
Revised:  British rule was suspended in February 1942, when the Imperial Japanese Army invaded Singapore during the Pacific Front of World War II and renamed it Syonan-to . After the war, Singapore was returned to British rule.
Edit intent: coherence