Complex sentence: In 2017 the California Public Utilities Commission installed 396 refrigerator-sized stacks of Tesla batteries at the Mira Loma substation in Ontario, California that are capable of powering 15,000 homes for over four hours.
Split into simpler sentences: In 2017 the California Public Utilities Commission installed 396 refrigerator-sized stacks of Tesla batteries at the Mira Loma substation in Ontario, California. The array is capable of powering 15,000 homes for over four hours.