Complex sentence: He developed the "high rate pond system" of shallow, mixed, raceway ponds to maximize algae productivity, which are still in use today for over 90% of the world's commercial microalgae production.
Split into simpler sentences: He developed the "high rate pond system" of shallow, mixed raceway ponds to maximize algae productivity. This design is still in use today, responsible for over 90% of the world's commercial microalgae production.