Complex sentence: Hitler acknowledged both Zeitzler's plan and Model's objections to it as worthy of consideration; and therefore, in the conference of senior officers and Eastern Front commanders held from 3 to 4 May, he presented both proposals.
Split into simpler sentences: Hitler acknowledged both Zeitzler's plan and Model's objections to it as worthy of consideration. Therefore in the conference of senior officers and Eastern Front commanders held from 3 to 4 May he presented both proposals.