Complex sentence: Moreman, p.12 All volunteers went through a six-week intensive commando course at Achnacarry in the Scottish Highlands, which concentrated on fitness, speed marches, weapons training, map reading, climbing, small boat operations, and demolitions both by day and by night.
Split into simpler sentences: Moreman, p.12 All volunteers went through the six week intensive commando course at Achnacarry. The course in the Scottish Highlands concentrated on fitness, speed marches, weapons training, map reading, climbing, small boat operations and demolitions both by day and by night.