Complex sentence: Taktser was originally pasture land for the larger village of Balangtsa, about two hours walk away, where cattle were brought to feed on the rich fields and which caused them to give very rich milk.
Split into simpler sentences: Taktser was originally an area of pasture land for the larger village of Balangtsa, about two hours walk away. Cattle were brought to feed on the the fertile grazing lands, which caused them to give very rich milk.