Complex sentence: Other Tyler foes claimed that he had wept himself into the White House, after crying at Clay's defeat; this was unlikely, as the Kentuckian had backed Tyler's opponent Rives in the Senate election.
Split into simpler sentences: Other Tyler foes claimed that he had wept himself into the White House, after crying at Clay's defeat. This was unlikely, as the Kentuckian had not reciprocated Tyler's support, backing Rives in the Senate election.