Simplify the following text for a Grade 9 native English-speaking person.
Original: The term was coined by Thomas Henry Huxley in April 1860 , and was used to describe evolutionary concepts , including earlier concepts such as Malthusianism and Spencerism .
Simplified: The term was coined by Thomas Henry Huxley in April 1860 . He used it to describe evolutionary concepts , including earlier concepts such as Malthusianism and Spencerism .