Complex sentence: While the rest of Phelp's brigade fell back, The 14th Brooklyn held its ground along with elements of the 6th Wisconsin of the Black Hats (Western iron Brigade) combined into a mass of soldiers pushing the Confederates up to Dunkard Church.
Split into simpler sentences: While the rest of Phelp's brigade fell back, the 14th Brooklyn held its ground along with elements of the 6th Wisconsin of the Black Hats (Western iron Brigade). This effort combined into a mass of soldiers pushing the Confederates up to Dunkard Church.