Complex sentence: Apel (2001,42; 323ff) argued that an institutionalised apprenticeship system must have existed craftsman-ship was transmitted by inheritance in certain families living in the vicinity of abundant resources of high-quality flint.
Split into simpler sentences: Apel (2001,42; 323ff) argued that an institutionalised apprenticeship system must have existed. Craftsmanship was transmitted by inheritance in certain families living in the vicinity of abundant resources of high-quality flint.