Complex sentence: So, out of grief Drona descended from his chariot, laid down his arms and sat in meditation by closing his eyes, his soul went to Heaven in search of Ashwatamma's soul.
Split into simpler sentences: So, out of grief Drona descended from his chariot, laid down his arms and sat in meditation by closing his eyes. Drona's soul went to Heaven in search of Ashwatamma's soul.