Complex sentence: With the extra time gained by Malien, Tiaan was able to make Vithis see sence and uncovered that it was Tirior of Clan Nataz that had betrayed Inthis and after sending her to the Well, Vithis too decided to take that way out.
Split into simpler sentences: With the extra time gained by Malien, Tiaan was able to make Vithis see sence and uncovered that it was Tirior of Clan Nataz that had betrayed Inthis. After sending Tirior to the Well, Vithis too decided to take that way out.