Complex sentence: At the beginning of the season manager Stefano Colantuono committed his future to the club, however, on 04/03/2015 he was sacked after a poor run of form which left Atalanta only 3 points above the relegation zone.
Split into simpler sentences: At the beginning of the season, manager Stefano Colantuono committed his future to the club. On 4 March 2015, however, he was sacked after a poor run of form which left Atalanta only three points above the relegation zone.