Complex sentence: In early June 2014, FreeBSD announced concrete plans to migrate from GNATS to Bugzilla, claiming that Bugzilla supports finer granularity for categories and keywords and that GNATS is missing many features that people expect from a modern bug tracker.
Split into simpler sentences: In early June 2014, FreeBSD announced concrete plans to migrate from GNATS to Bugzilla, claiming that Bugzilla supports finer granularity for categories and keywords. Furthermore, the announcement states that GNATS is missing many features that people expect from a modern bug tracker.