Complex sentence: Company K from Fort Halleck, Nev., joined the battalion 18 February, which now consisted of Companies B, F, G and K, under Captain Biddle, who was soon succeeded by Captain Bernard.
Split into simpler sentences: Company K from Fort Halleck, Nev., joined the battalion on 18 February. The battalion now consisted of Companies B, F, G and K, under Captain Biddle, who was soon succeeded by Captain Bernard.