Complex sentence: His off the field activities brought an end to his cricket career after serving a drugs ban in 1997, he tested positive for Cannabis in the opening round of matches in 2005 and was banned for 4 months.
Split into simpler sentences: His off the field activities brought an end to his cricket career. After serving a drugs ban in 1997, he tested positive for Cannabis in the opening round of matches in 2005 and was banned for 4 months.