Complex sentence: Instead, he ran in the Democratic primary for the Texas State Senate, having lost the nomination to Judith Zaffirini, a Laredo educator and businesswoman, who in turn won the seat in the general election over the Republican Jeff Wentworth of San Antonio.
Split into simpler sentences: Instead, he ran unsuccessfully in the Democratic primary for the Texas State Senate. He lost the nomination to Judith Zaffirini, a Laredo educator and businesswoman, who in turn won the seat in the general election over the Republican Jeff Wentworth of San Antonio.