Complex sentence: He became an apprentice to Camille Loyal in Belleville, working seventy hour weeks which included making up to sixty Galette des Rois over the course of three days for Epiphany.
Split into simpler sentences: He became an apprentice to Camille Loyal in Belleville, working seventy hour weeks. Michel's tasks at the pâtisserie included making up to sixty Galette des Rois over the course of three days for Epiphany.