Complex sentence: In the spring, Loving sold his cattle for gold and tried to leave for Texas; however the American Civil War had broken out and the Union authorities prevented him from returning to the South until Kit Carson and others interceded for him.
Split into simpler sentences: In the spring, Loving sold his cattle for gold and tried to leave for Texas. However, the American Civil War had broken out and the Union authorities prevented him from returning to the South until Kit Carson and others interceded for him.