Preparing animation objects and groups for an upload to a game assets store

I have purchased two 3D models. one is a static object (https://sketchfab.com/3d-models/alien-robot-ee6bbb81a7d74d3687328f86b71bb2ed), the other one is animated (https://sketchfab.com/3d-models/alien-infantry-trooper-animations-714455e16a4849068058e8920a5365c6#download) but in a continuous series of movements and i need it to be broken down into separate animations

this is a test project to evaluate a longer term cooperation on both 3D model/character creation, animation, VFX and potentially even more