Complex sentence: Only 125 of the 430 Suluks on Mantanani survived while only 54 of the 120 in the Suluk population of Dinawan survived, with all the men killed by the Japanese.
Split into simpler sentences: Only 125 of the 430 Suluks on Mantanani survived. Only 54 of the 120 in the Suluk population of Dinawan survived, with all the men killed by the Japanese.