Student or Learner
Eragon looked up at the shining expanse of gold. Embossed across the doors was a life-sized oak tree, the leaves of which formed an arching canopy that joined with the roots below to inscribe a great circle about the trunk. Sprouting from either side of the trunk’s midsection were two thick bundles of branches, which divided the space within the circle into quarters.
(C. Paolini; Inheritance)
Does the part in bold mean that there were two thick bundles of branches on one side and another two ones on the other?
It's not absolutely clear. If the leaves and the roots made a circle, then there would be a semi-circle on each side of the trunk. It would seem that you'd need only one bundle of branches on each side to divide each semi-circle into two halves, making a total of four quarters.