Complex sentence: As a result, BSD code can be used in proprietary software that only acknowledges the authors; for instance, the IP stack in Microsoft Windows NT 3.1 and Mac OS X are derived from BSD-licensed software.
Split into simpler sentences: As a result, BSD code can be used in proprietary software that only acknowledges the authors. For instance, the IP stack in Microsoft Windows NT 3.1 and Mac OS X are derived from BSD-licensed software.