Complex sentence: Sous-vide cooking continues until the center of the food has reached its target temperature; if it continues after this, the food will not be overcooked, and it will not cook more after it stops being heated.
Split into simpler sentences: Sous-vide cooking continues until the center of the food has reached its target temperature. If it continues after this, the food will not be overcooked, and it will not cook more after it stops being heated.