Complex sentence: Her study of marine food cycle in sea mud led her to introduce new terminology to allow improved understanding of marine organisms involved in these cycles, namely macrobenthos, meiobenthos and microbenthos, to refer to groupings by size.
Split into simpler sentences: Her study of marine food cycle in sea mud led her to introduce the new term meiobenthos to join the terminology of macrobenthos and microbenthos. This has to allow improved understanding of marine organisms involved in these cycles through clearer reference to groupings by size.