Complex sentence: Conversion of metre gauge to broad gauge under Project Unigauge started in 1991 and one of the tracks from Delhi railway station to Rewari was converted to broad gauge in 1995.
Split into simpler sentences: Conversion of metre gauge to broad gauge under Project Unigauge started in 1991. The Delhi-Rewari railway line had double metre gauge tracks and one of the tracks was converted to broad gauge in 1995.