Complex sentence: Users of version 3.0 (aka 2.5) last saw an update to the code in February 2010, since that date both v1.0 and v3.0 have been'frozen'.
Split into simpler sentences: Users of version 3.0 (aka 2.5) last saw an update to the code in February 2010. Since that date both v1.0 and v3.0 have been'frozen'.