Complex sentence: De Vrij made his official debut for Feyenoord's first team on 24 September 2009, when he replaced Kelvin Leerdam in the 58th minute in the KNVB Cup away match against Harkemase Boys (0--5).
Split into simpler sentences: De Vrij made his official debut for Feyenoord's first team on 24 September 2009. He replaced Leerdam in the 58th minute in the KNVB Cup away match against Harkemase Boys (0--5).