All these had married foreign women, and they put them away with their children: The demonstrative pronoun these refers to the Jewish men listed in verses 18-35. An alternative model for this verse is:

• All these men had married women who were not Jews, and they sent them away, along with their children.

Quoted with permission from Bullard, Roger A. and Hatton, Howard A. A Handbook on 1-2 Esdras. (UBS Helps for Translators). Miami: UBS, 2019. For this and other handbooks for translators see here.