Original sentence: Recently he lectured on the Theory of Sports Psychology at the National Seminars for Basketball Coach Candidates that was organized by the Turkish Basketball Federation in Rize, Turkey, held between April 22 and May 3, 2008
Edited sentence: Recently he lectured on the Theory of Sports Psychology at the National Seminars for Basketball Coach Candidates that was organized by the Turkish Basketball Federation in Rize, Turkey, held between 22 April and 3 May 2008