Complex sentence: Biratnagar's demography chiefly consists of groups like Brahman, Kshtriya, Madhesis, Marwaris, Tharus and it consists a significantly large Muslim population in Nepal.
Split into simpler sentences: Biratnagar's demography chiefly consists of groups like Brahman, Kshtriya, Madhesis, Marwadis, Tharus. It consists a significantly large Muslim population in Nepal.