Complex sentence: As of version 1.2.0, the majority of the MantisBT codebase still uses procedural programming principles, however some sections have been converted to make use of PHP 5's new object model.
Split into simpler sentences: As of version 1.2.0, the majority of the MantisBT codebase still uses procedural programming principles. Some sections of the MantisBT codebase have been converted to make use of PHP 5's new object model.