Complex sentence: During the period of the British in March 1819, John Sullivan made a bridle path up the hill from Sirumugai to Kotagiri that was the only route to the Nilgris from Coimbatore until 1832.
Split into simpler sentences: During the period of British in March 1819, John Sullivan made a bridle path up the hill from Sirumugai to Kotagiri. This was the only route to the Nilgris from Coimbatore until 1832.