Complex sentence: The bioavailability of oral administration of oxycodone averages 60--87%, with rectal administration yielding the same results; intranasal varies between individuals with a mean of 46%.
Split into simpler sentences: The bioavailability of oral administration of oxycodone averages 60--87%. The intranasal bioavailability of Oxycodone is 45-70%, with rectal administration yielding the same results as oral administration; intranasal varies between individuals with a mean of 46%.