Complex sentence: Where they persist, the societies and cultures which gave rise to these civilizations continue to adapt and evolve; they also uphold various traditions and practices which relate back to these earlier times, even if combined with those more recently adopted.
Split into simpler sentences: Where they persist, the societies and cultures which gave rise to these civilizations continue to adapt and evolve. However, many of these peoples still uphold various traditions and practices which relate back to these earlier times, even if combined with those more recently adopted.