Complex sentence: The present population of the Sentinelese is not known with any great degree of accuracy, and estimates have been produced ranging from a low of fewer than 40, through a median of around 250, and up to a maximum of 500.
Split into simpler sentences: The present population of the Sentinelese is not known with any great degree of accuracy. Estimates have been produced ranging from a low of fewer than 40, through a median of around 250, and up to a maximum of 500.