Are these multiple sentences correctly worded?

Quenthel and Gromph later had another discussion about the war, and the matron mother explained that in addition to Tos'un, the contingent sent to the east would be commanded by Tiago and Saribel. Quenthel also revealed that she was determined to make certain that Tiago survived the war, but Tos'un did not, and that after the end of the conflict, she planned on using House Do'Urden to gain more power on the Ruling Council.