Complex sentence: McDonnell had a role in the 2003 feature film Conspiracy of Silence however it was RTÉ Television's Police Drama Single-Handed which was McDonnell's Television career break and he has starred in all four series of the programme.
Split into simpler sentences: McDonnell had a role in the 2003 feature film Conspiracy of Silence. It was however RTÉ Television's Police Drama Single-Handed which was McDonnell's Television career break and he has starred in all four series of the programme.