Complex sentence: The Southern Pacific Company began building track southward through the San Joaquin Valley and reached Bakersfield, California on November 8,1874 and began the construction of the Tehachapi Loop over the Tehachapi Pass and across the Mohave Desert into Southern California.
Split into simpler sentences: The Southern Pacific Company began building track southward through the San Joaquin Valley and reached Bakersfield, California on November 8,1874. It then began the construction of the Tehachapi Loop over the Tehachapi Pass and across the Mohave Desert into Southern California.