Is this small passage properly structured and worded?

Quenthel explained that House Do'Urden would be formed through a cooperation of the other ruling Houses, with Sos'umptu temporarily assuming the position of Matron Mother of the Eighth House, Tos'un becoming the patron of the House, and Bregan D'aerthe serving as the House’s garrison. Quenthel then informed the other matron mothers that Tsabrak was journeying east to the surface to enact the Darkening, and after he completed the spell, Menzoberranzan would follow the Spider Queen’s command by waging war against the Silver Marches.