Complex sentence: The name Kangchenjunga is derived from Sanskrit काञ्चनगंगा "Kanchana Ganga", Kanchana means gold and Ganga is the river which flows in the region and the river shines like gold (kanchana) and hence the name Kanchana Ganga was given to this mountain.
Split into simpler sentences: The name Kangchenjunga is derived from Sanskrit काञ्चनगंगा "kanchana ganga": "kanchana" means gold and "ganga" is the river which flows in the region. The river shines like gold and hence the name Kanchana Ganga was given to this mountain.