Complex sentence: After long consideration, the Emperor refused to step down, but instead gifted Valten with Sigmar's hammer Ghal Maraz, proclaiming him to be the spiritual leader of the people of the Empire, and vowing to lead the imperial armies by his side.
Split into simpler sentences: After long consideration, the Emperor refused to step down, but instead gifted Valten with Sigmar's hammer Ghal Maraz. The Emperor proclaiming Valten as the spiritual leader of the Empire, and vowed to lead the Imperial armies by his side.