Complex sentence: Polhanas died in 1747 and was succeeded by his son Gyurme Namgyal who was not so submissive to the Qing and started building a Tibetan army and conspiring against them with the Dzungars.
Split into simpler sentences: Polhanas died in 1747 and was succeeded by his son Gyurme Namgyal who was not so submissive to the Qing. He started building a Tibetan army and conspiring against them with the Dzungars.