Complex sentence: California has a total of 6,108 megawatts installed wind generation capacity, as of the end of December 2015, wind energy (including power supplied from other states) now supplies about 5% of California's total electricity needs.
Split into simpler sentences: California has a total of 6,108 megawatts installed wind generation capacity, as of the end of December 2015. Wind energy (including power supplied from other states) now supplies about 5% of California's total electricity needs.