Complex sentence: The ancestral roaming and fishing grounds of the Sama-Bajau straddled the borders of the Philippines, Malaysia, and Indonesia, sometimes voyaging as far as the Timor and Arafura Seas.
Split into simpler sentences: The ancestral roaming and fishing grounds of the Sama-Bajau straddled the borders of the Philippines, Malaysia, and Indonesia. And they have sometimes voyaged as far as the Timor and Arafura Seas.