Complex sentence: De León was elected President pro tempore of the California State Senate on June 19,2014, and was sworn in on October 15,2014; he is the first Latino to hold that position in over 130 years.
Split into simpler sentences: De León was elected Senate President Pro Tempore on June 19,2014, and was sworn in on October 15,2014. He is the first Latino to hold that position in over 130 years.