Complex sentence: When Lord Vishnu cut up the body of Sati into pieces so that Lord Shiva would calm down and stop his Tandava, the pieces were scattered over various places in the Indian subcontinent.
Split into simpler sentences: When Lord Vishnu cut the body of Sati into pieces so that Lord Shiva would calm down and stop his Tandava. The pieces were scattered over various places in the Indian subcontinent.