Complex sentence: Horsford previously served in the Nevada Senate, representing Clark County's 4th Senate District from 2005 to 2012; he also served Nevada's first African-American state senate Majority Leader and is the first person of color to represent Nevada in Congress.
Split into simpler sentences: Horsford previously served in the Nevada Senate, representing Clark County's 4th Senate District from 2005 to 2012. He also served Nevada's first African-American state senate Majority Leader and is the first person of color to represent Nevada in Congress.