Complex sentence: Between himself, Pritam Singh and Fujiwara, Mohan Singh formulated on contacting Indians in the British Indian Army in South-east Asia, and also began recruiting from amongst those captured by the Japanese in Malaya, even prior to the fall of Singapore.
Split into simpler sentences: Between himself, Pritam Singh and Fujiwara, Mohan Singh formulated plans of contacting Indians in the British Indian Army in South-east Asia. He also began recruiting from amongst those captured by the Japanese in Malaya, even prior to the fall of Singapore.