Complex sentence: The site is an archaeological park at the centre of a protected forest, and a site of cooperative European archaeological efforts, a training ground for young archaeologists as well as a centre for interpreting Gaulish culture for a popular audience.
Split into simpler sentences: The site is an archaeological park at the centre of a protected forest. It is the focus of cooperative European archaeological efforts, a training ground for young archaeologists, and a centre for interpreting Gaulish culture for a popular audience.