Complex sentence: Herrera spent the following three campaigns on loan, being relegated from the top division with RCD Mallorca, Real Burgos CF and UE Lleida; in between those spells, he was demoted to Barcelona's B-team.
Split into simpler sentences: Herrera spent the following three campaigns on loan, being relegated from the top division with RCD Mallorca, Real Burgos CF and UE Lleida. In between those spells, he was demoted to Barcelona's B-team.