Complex sentence: On 25 June 2009, after producing slightly the same numbers with Atlético, de las Cuevas moved to fellow top level outfit Sporting de Gijón on a four-year deal--however, Atlético retained an option to rebuy in the first three.
Split into simpler sentences: On 25 June 2009, after producing slightly the same numbers with Atlético, de las Cuevas moved to fellow top level outfit Sporting de Gijón on a four-year deal. However, Atlético retained an option to rebuy in the first three.