Complex sentence: The Democratic nominee, incumbent President Barack Obama, and his running mate, Vice President Joe Biden, were re-elected to a second term, defeating the Republican nominee, former Massachusetts Governor Mitt Romney, and his running mate, Representative Paul Ryan of Wisconsin.
Split into simpler sentences: The Democratic nominee, incumbent President Barack Obama, and his running mate, Vice President Joe Biden, were elected to a second term. Their major challengers were the Republican nominee, former Massachusetts Governor Mitt Romney, and his running mate, Representative Paul Ryan of Wisconsin.