A second key invention was the ability to convert the sun's energy into chemical bonds, a process called photosynthesis (upon which all life now depends).
(A second key invention; was; the ability to convert the sun's energy into chemical bonds, a process) (a process; called; photosynthesis) (all life; depends; T:now)
A second key invention a process all life
was called depends
the ability to convert the sun's energy into chemical bonds, a process
photosynthesis
T:now