Complex sentence: Chlorophyll fluorescence is light re-emitted by chlorophyll molecules during return from excited to non-excited states and used as indicator of photosynthetic energy conversion in higher plants, algae and bacteria.
Split into simpler sentences: Chlorophyll fluorescence is light re-emitted by chlorophyll molecules during return from excited to non-excited states. It is used as an indicator of photosynthetic energy conversion in higher plants, algae and bacteria.