Complex sentence: Sarah finally agrees--if she can stay with Rex or Cristian--claiming that she has been staying "off the Buchanan grid" and living off money from her parents, who believe she is abroad with an important job.
Split into simpler sentences: Sarah finally agrees--if she can stay with Rex or Cristian. Sarah claims she has been staying "off the Buchanan grid" and living off money from her parents, who believe she is abroad with an important job.