CINEMA 4D Studio is a powerful program that enables you to create advanced 3D graphics. The program makes it easy to create character rigs and advanced character animations. You can also generate advanced 3D effects and make thousands of objects collide with each other.
This program received 8 awards
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You can't, you can only convert after applying effects, it will not work with other software.
How can I convert a 2D plan from AutoCad to Cinema 4d?
You probably cannot: AutoCad is Autodesk whereas Cinema 4D is Maxon.
Use Spine. I never used it but I have seen videos of Spine with 2D animations.