Complex sentence: Old Tjikko is the world's oldest living individual clonal tree, however, there are many examples of much older clonal colonies (multiple trees connected by a common root system), such as "Pando", estimated to be over 80,000 years old.
Split into simpler sentences: Old Tjikko is the world's oldest living individual clonal tree. However, there are many examples of much older clonal colonies (multiple trees connected by a common root system), such as "Pando", estimated to be over 80,000 years old.