Complex sentence: Pollard has also been involved in the "Stonehenge Riverside Project" since 2004: a field project that he jointly directs with Dr Mike Parker Pearson, Dr Colin Richards, Dr Julian Thomas, Dr Chris Tilley and Dr Kate Welham.
Split into simpler sentences: Pollard has also been involved in the "Stonehenge Riverside Project" since 2004. The field project, is jointly directed with Dr Mike Parker Pearson, Dr Colin Richards, Dr Julian Thomas, Dr Chris Tilley and Dr Kate Welham.