Complex sentence: In his career, Hargrave invented many devices, but never applied for a patent on any of them: he needed the money, and he was a passionate believer in scientific communication as a key to furthering progress.
Split into simpler sentences: In his career, Hargrave invented many devices, but never applied for a patent on any of them. He needed the money but he was a passionate believer in scientific communication as a key to furthering progress.