Complex sentence: The 2005/2006 track season proved to be very successful for Colonel By; by sending several athletes to the East OFSAA and OFSAA track and field meet, they have achieved provincial recognition.
Split into simpler sentences: The 2005/2006 track season proved to be very successful for Colonel By. They sent several athletes to the East OFSAA and OFSAA track and field meet, which achieved provincial recognition.