Complex sentence: On 17 June 2010, the 19-year-old Kieftenbeld signed a four-year contract with Eredivisie club Groningen, who paid a €300,000 fee for the player.
Split into simpler sentences: On 17 June 2010, Kieftenbeld signed a four-year contract with Groningen. Groningen paid a €300,000 fee for the player.