Complex sentence: The ship was called "L' Amitie" when it embarked from France, but was referred to as "La Amistad" when it disembarked in Louisiana, which was at that time a Spanish colony.
Split into simpler sentences: The ship was entered as the "L' Amitie" when it embarked from France. It was referred to as "La Amistad" when it disembarked in Louisiana, which was at that time a Spanish colony.