Complex sentence: Magruder was told at that morning's war council to move to Huger's right, but he was unaware of Huger's position, and sent Major Joseph L. Brent to locate Huger's right flank.
Split into simpler sentences: Magruder was told at that morning's war council to move to Huger's right. However, he was unaware of Huger's position, and sent Major Joseph L. Brent to locate Huger's right flank.