Complex sentence: Roopkund (locally known as Mystery Lake) is a high altitude glacial lake in Uttarakhand state of India, lies in the lap of Trishul massif and famous due to hundreds of human skeletons found at the edge of the lake.
Split into simpler sentences: Roopkund (locally known as Mystery Lake) is a high altitude glacial lake in the Uttarakhand state of India. It lies in the lap of Trishul massif and is famous for the hundreds of human skeletons found at the edge of the lake.