Complex sentence: An archaeological dig at the site revealed that Narrabeen Man was found in a posture unlike a tribal ceremor across the chest, the Narrabeen Man was on his side with one arm across his head.
Split into simpler sentences: An archaeological dig at the site revealed that Narrabeen Man was found in a posture unlike a tribal ceremonial burial. Rather than lying on his back with arms by the side or across the chest, the Narrabeen Man was on his side with one arm across his head.