If photosynthesis required chlorophyll molecules to absorb solar energy, developing artificial systems would be fairly simple.
(photosynthesis; required; chlorophyll molecules; to absorb solar energy) (chlorophyll molecules; to absorb; solar energy) (developing artificial systems; would be; fairly simple)
photosynthesis chlorophyll molecules developing artificial systems
required to absorb would be
chlorophyll molecules to absorb solar energy
solar energy
fairly simple