Complex sentence: There were only 35,000 British soldiers in India, in widely scattered cantonments and reinforcements took months to arrive by sea, but fortunately for the British it was almost exclusively soldiers of the Bengal Army who mutinied.
Split into simpler sentences: There were only 35,000 British soldiers in India, in widely scattered cantonments. Fortunately for the British it was almost exclusively soldiers of the Bengal Army who mutinied.