Complex sentence: From these towns they expanded inland to the lands of the Muisca in the highlands, but were less successful on several parts of the coast, where unconquered pockets remained, notably at the Rio de la Hacha and the Gulf of Urabá.
Split into simpler sentences: From these towns they expanded inland to the lands of the Muisca in the highlands. They were less successful on several parts of the coast, where unconquered pockets remained, notably at the Rio de la Hacha and the Gulf of Urabá.