Complex sentence: Instead, Taylor's searing verbal attacks were counterproductive as they galvanized the Vietnamese officers around the embattled Khanh, whose leadership was then under threat from his fellow generals, as well as Taylor, who had fallen out with him and was seeking his removal.
Split into simpler sentences: Instead, Taylor's searing verbal attacks were counterproductive as they galvanized the Vietnamese officers around the embattled Khanh. At the time, Khanh's leadership was under threat from his fellow generals, as well as Taylor, who had fallen out with him and was seeking his removal.