Complex sentence: In the first half-year at SC Cambuur, he did not live up to his promise, partly because he often was used as a winger, by the strong play of Mark de Vries in rush hour.
Split into simpler sentences: In the first half-year at SC Cambuur, he is not always up to its promise. Partly because he often was used as a winger, by the strong play of Mark de Vries in rush hour.