Complex sentence: The second way in which things develop is more resonant of pure invention, in that the inventor creates solely by means of his own engagement with his milieu; the invention in this case is experientially and theoretically untied to earlier thinking.
Split into simpler sentences: The second way in which things develop is more resonant of pure invention, in that the inventor creates, solely by means of his own engagement with his milieu; the invention. In this case, the invention is experientially and theoretically untied to earlier thinking.