Complex sentence: On 1 July 2003, Jonker was appointed as the head of MVV Maastricht, a position which he held for close to three years in all, and under which the Sterrendragers got to the quarterfinals of the KNVB Cup.
Split into simpler sentences: On 1 July 2003, Jonker was appointed as the head of MVV Maastricht. With him at the helm of the club, the Sterrendragers got to the quarterfinals of the KNVB Cup.