Complex sentence: His second choice Bob Cousy declined, stating he did not want to coach his former teammates, and the third choice Tom Heinsohn also said no, because he did not think he could handle the often surly Russell.
Split into simpler sentences: His second choice was Bob Cousy, who declined the invitation, stating that he did not want to coach his former teammates. Third choice Tom Heinsohn also said no, because he did not think he could handle the often surly Russell.