Complex sentence: On March 19,1880, the Sacramento Light Artillery (California) was consolidated with the 1st Infantry Battalion (California) to form the 1st Artillery Regiment (California), with headquarters in Sacramento, as part of the California National Guard.
Split into simpler sentences: On March 19,1880, the the 1st Artillery Regiment (California) was formed from the consolidation of the Sacramento Light Artillery (California) and the 1st Infantry Battalion (California). The headquarters of the 1st Artillery Regiment (California) was in Sacramento and the unit was part of the California National Guard.