Complex sentence: Ecological units are a composite of an environment piece and a behavior piece--they are hybrid artifacts that exist as quasi-objective entities much like Searle's "observer relative features of the world" (Searle, 1995).
Split into simpler sentences: Ecological units are a composite of an environment piece and a behavior piece. They are hybrid artifacts that exist as quasi-objective entities much like Searle's "observer-relative features of the world" (Searle, 1995).