Original sentence: In May 2010, version 2.2.0 was released and brought many new features and bugfixes.Regular end-users requiring a stable environment were still recommended by developers to use the stable 1.6 release series
Edited sentence: In May 2010, version 2.2.0 was released and brings an unprecedented number of new features and bugfixes.Regular end-users requiring a stable environment are still recommended by developers to use the stable 1.6 release series