Complex sentence: Lake Tanganyika is considered the oldest of the East African lakes, and has the most morphologically and genetically diverse groups of cichlids this lake also has the largest number of endemic species of cichlids of all African lakes.
Split into simpler sentences: Lake Tanganyika is considered the oldest of the East African lakes, and has the most morphologically and genetically diverse groups of cichlids. This lake also has the largest number of endemic species of cichlids of all African lakes.