Complex sentence: Pecos Bill also had a love interest named Slue-Foot Sue, who rode a giant catfish down the Rio Grande, and was the best women of Bill's to go on a Romantic relationship.
Split into simpler sentences: Pecos Bill also had a love interest named Slue-Foot Sue, who rode a giant catfish down the Rio Grande. And the best women of Bill's to go on a Romantic relationship.