Complex sentence: The amber was bought from a mine in the Hukawng Valley in Burma, and is thought to be 100 million years old, 40 million years older than the next-oldest known bee species.
Split into simpler sentences: The amber was bought from a mine in the Hukawng Valley in Burma. The sample discovered is thought to be 100 million years old, 40 million years older than the next-oldest known bee species.