Complex sentence: Kniep is remembered for studies of sexuality in lower plants, and phytophysiological research involving chemotaxis, nastic movements, and photosynthesis and respiration of marine plants.
Split into simpler sentences: Kniep is remembered for studies of sexuality in lower plants. He also conducted phytophysiological research of chemotaxis and nastic movements, as well as ecophysiological investigations involving photosynthesis and respiration of marine plants.