Complex sentence: Evidently it eventually fell under the power of the Nabateans, as the Romans (with support from the Ghassanids or Ghassasinah الغساسنة) conquered it from them in 105 AD.
Split into simpler sentences: Evidently it eventually fell under the power of the Nabateans. The Romans (with support from the Ghassanids or Ghassasinah الغساسنة) conquered it from them in 105 AD.