Complex sentence: The bread should sound hollow when tapped if it is fully cooked; return the bread, out of the tin to the oven for a further 5--10 minutes to crisp up the base and sides.
Split into simpler sentences: The bread should sound hollow when tapped if it is fully cooked. Return the bread to the oven (out of the tin) for a further 5--10 minutes to crisp up the base and sides.