General meaning of being connected or participating:
* Engaged
* Concerned
* Implicated
* Entangled
* Mixed up
* Enmeshed
* Embedded
* Intertwined
* Complicated
* Integrated
* Included
* Enlisted
* Participated
* Implicated
Specific meaning of being actively participating:
* Active
* Engaged
* Contributing
* Playing a part
* Taking part
* Participating
* Contributing
Meaning of being implicated or responsible:
* Guilty
* Responsible
* Accountable
* Liable
* Culpable
* Complicit
Meaning of being complex or intricate:
* Complex
* Intricate
* Elaborate
* Complicated
* Detailed
* Multifaceted
The best word to use will depend on the specific context and the nuance you want to convey.