Complex sentence: Both the children grew up together and were a perfect made-for-each-other, but when their horoscopes were tallied, it was predicted that Lakshmindara would die of snake-bite on the wedding night.
Split into simpler sentences: Both the children grew up together and were a perfect made-for-each-other. However, when their horoscopes were tallied, it was predicted that Lakshmindara would die of snake-bite on the wedding night.