Complex sentence: Initially all the Special Forces candidates will come from the Commando Battalion only requiring 10 weeks of training, after that Special Forces recruiting will be conducted throughout the army, and initial Special Forces training will be 15 weeks.
Split into simpler sentences: Initially all the Special Forces candidates were planned to come from the Commando Battalion, only requiring 10 weeks of training. However, after the initial period it was planned that Special Forces recruiting was to be conducted throughout the army, and initial Special Forces training will be 15 weeks.