I don’t think that the original question ‘as I am an owner is the Managing Agent obligated to send me a complete breakdown of all of the expenses?’ has been answered.
The strata manager is not really obliged to send you anything, but they are obliged to let you see any records and correspondence related to the strata scheme. This may involve you making an appointment, going to their office and paying a nominal set fee (about $30) for doing so.
If you want to keep a tighter grip on your expenses, then look at the service provided by our sponsors Stratabox, whereby all owners can potentially track all expenses all the time.