Complex sentence: Modern scholars have suggested that his mother was a daughter of a powerful noble who wanted to be related with the royal household through marriage, because the enthronement of Ratsadathirat appears to have been supported by a group of nobles, despite his minority.
Split into simpler sentences: Modern scholars have suggested that his mother was a daughter of a powerful noble who wanted to be related with the royal household through marriage. For that reason, the enthronement of Ratsadathirat appears to have been supported by a group of nobles, despite his minority.