Complex sentence: Franck Adrien (Albert Dupontel), a bank robber convicted of a heist and sentenced to six months in prison, shares a cell with seemingly weak Jean Louis Morel (Stéphane Debac).
Split into simpler sentences: Franck Adrien (Albert Dupontel) is prisoner who was sentenced to six months in prison for a heist. The former bankrobber shares a cell with apparently soft inmate Jean Louis Morel (Stéphane Debac).