Complex sentence: In 2015 it became known that CA is involved in the 2016 U.S. Presidential Campaign and in part owned by the family of Robert Mercer, a hedge-fund billionaire and a main supporter of Ted Cruz.
Split into simpler sentences: In 2015 it became known that CA is involved in the 2016 U.S. Presidential Campaign. It is part owned by the family of Robert Mercer, a hedge-fund billionaire and a main supporter of Ted Cruz.