Complex sentence: Despite their ethnic diversity and linguistic and dialectal distinctions, the various Quechua ethnic groups do have a number of common cultural characteristics, which however they also share with the Aymara, or even with all the indigenous peoples of the central Andes.
Split into simpler sentences: Despite their ethnic diversity and linguistic and dialectical distinctions, the various Quechua ethnic groups do have numerous cultural characteristics in common. They also share many of these with the Aymara, or other indigenous peoples of the central Andes.