Complex sentence: As of version 7.0 new features include support for Python scripting, and at least since version 7.3 "reversible debugging" allowing a debugging session to step backward, much like rewinding a crashed program to see what happened, have been added.
Split into simpler sentences: As of version 7.0 new features include support for Python scripting. At least since version, 7.3 "reversible debugging"--allowing a debugging session to step backward, much like rewinding a crashed program to see what happened--has been added.