Complex sentence: Since then, the popularity of the Internet has brought on a constant stream of new users and thus, from the point of view of the pre- 1993 Usenet users, the influx of new users in September 1993 never ended.
Split into simpler sentences: Since then, the rise in popularity of the Internet has brought on a constant stream of new users. Thus, from the point of view of the pre- 1993 Usenet users, the influx of new users in September 1993 never ended.