Complex sentence: System V was undermined by the rapid rise of free Unix-like systems, notably Linux, and the vast majority of programmers ignored the closed STREAMS in favour of the BSD-licenced Sockets.
Split into simpler sentences: System V was undermined by the rapid rise of free Unix-like systems, notably Linux. As these systems grew in popularity, the vast majority of programmers ignored the closed STREAMS in favour of the BSD-licenced Sockets.