Complex sentence: Their eggs are 5.5-6 mm in diameter, (among the largest fish eggs known), yellow tinted and opaque, laying on the ocean floor, in shoal water, sticking together, in loose clumps, surrounded by seaweed and stones.
Split into simpler sentences: Their eggs are 5.5-6 mm in diameter, (among the largest fish eggs known), yellow tinted and opaque. The eggs are laid on the ocean floor, many times in shoal water, sticking together in loose clumps, surrounded by seaweed and stones.