Complex sentence: On December 9,1895, the 1st Artillery Regiment (California) was consolidated with the 8th Infantry Regiment (California) to form the 2nd Infantry Regiment (California), with headquarters in Sacramento, as part of the California National Guard.
Split into simpler sentences: On December 9,1895,2nd Infantry Regiment (California) was formed by consolidating the 1st Artillery Regiment (California) with the 8th Infantry Regiment (California). The headquarters of the 2nd Infantry Regiment (California) was in Sacramento and the unit was part of the California National Guard.