Complex sentence: The Nilgiri Mountain Railway is a single track, long metre gauge single-line railroad which connects the town of Mettupalayam with the hill station of Udagamandalam (Ootacamund).
Split into simpler sentences: The Nilgiri Mountain Railway is a single track, long metre gauge single-line railroad. In present-day it connects the town of Mettupalayam with the hill station of Udagamandalam (Ootacamund).