Complex sentence: In Longstreet's final report, he makes no mention of any other officer being in charge of the unit, nor does his report make any mention of the men of Pickett's division who surrendered with Pickett at Appomattox.
Split into simpler sentences: In Longstreet's final report, he makes no mention of any other officer being in charge of the unit. In point of fact he does not make any mention of the men of Pickett's division in his report, who surrendered with Pickett at Appomattox.