Complex sentence: Very little is known about the ancient history of the language; linguists such as Dr. David Zorc and Dr. Robert Blust speculate that the Tagalogs and other Central Philippine ethno-linguistic groups originated in Northeastern Mindanao or the Eastern Visayas.
Split into simpler sentences: Very little is known about the ancient history of the language. Linguists such as Dr. David Zorc and Dr. Robert Blust speculate that the Tagalogs and other Central Philippine ethno-linguistic groups originated in Northeastern Mindanao or the Eastern Visayas.