Complex sentence: She rode the 2008 Oak Tree meeting as she left Canada in October 2008 to ride in California as it lasted for 6 months out in California as she rode also the 2008 Hollywood Park fall meeting and the 2009 Santa Anita meeting.
Split into simpler sentences: She rode the 2008 Oak Tree meeting as she left Canada in October 2008 to ride in California. She spent a total of 6 months in California as she rode also the 2008 Hollywood Park fall meeting and the 2009 Santa Anita meeting.