Complex sentence: The biggest of the "quilombos", the Quilombo dos Palmares, consisted of many villages mostly of African slaves though they also consisted of other ethnicities and lasted for more than a century, resisting, often outnumbered, many colonial attacks.
Split into simpler sentences: The biggest of the "quilombos", the Quilombo dos Palmares, consisted of many villages, mostly of African slaves. They included other ethnicities and lasted for more than a century, resisting many colonial attacks.