Complex sentence: The eggs are deposited in the shallows from March to October; although a single female produces 77--109 oocytes per year, not all of these are ovulated and estimates of the actual number of eggs laid range from 9 to 41.
Split into simpler sentences: The eggs are deposited in the shallows from March to October. Although a single female produces 77--109 oocytes per year, not all of these are ovulated and estimates of the actual number of eggs laid range from 9 to 41.