Complex sentence: The unit participated in Lee's Cheat Mountain Campaign and Jackson's Valley operations before being assigned to General Early's, J.R. Jones', and W.Terry's Brigade, Army of Northern Virginia.
Split into simpler sentences: The unit participated in Lee's Cheat Mountain Campaign and Jackson's Valley Campaign. After Jackson's campaign finished, the regiment was assigned to General Early's, J.R. Jones', and W.Terry's Brigade, Army of Northern Virginia.