Complex sentence: This remote, forbidding planet, seething with dark side energy and echoing with the whispers of a thousand ghosts, was the burial world of the ancient Sith Empire, and has long been a sacred planet for the Sith Order.
Split into simpler sentences: This remote, forbidding planet seethes with dark side energy and echoes with the whispers of a thousand ghosts. It was the burial world of the ancient Sith Empire, and has long been a sacred planet for the Sith Order.