Complex sentence: Charles Darwin first recognized this phenomenon, the term was later coined by Huber in 1939; but Darwin did explain the idea of phylogenetic inertia based on his observations; he spoke about it when explaining the "Law of Conditions of Existence".
Split into simpler sentences: Charles Darwin first recognized this phenomenon, though the term was later coined by Huber in 1939. Darwin explained the idea of phylogenetic inertia based on his observations; he spoke about it when explaining the "Law of Conditions of Existence".