Complex sentence: However, the Karlani dialects, both in the southern and northern varieties, are lexicologically different and very varied, and moreover, they have a tendency towards a change in the pronunciation of vowels.
Split into simpler sentences: However, the Karlani dialects, both in southern and northern varieties, are lexicologically different and very varied. Moreover, the Karlani dialects have a tendency towards a change in the pronunciation of vowels.