Those pictures make me wonder what kind of building, where, and how can such small purlins be possible. If I was doing it I'd start by jacking up the damaged parts, remove all of the electrical and wood bits that were added for the electrical, and sister new purlins to the sides of the broken pieces. If you can't jack up from the floor you're going to need to rig something up to get it all back to where it should be. I would add a purlin on both sides and generously screw through the damaged piece all the way through into the other side. I'd use headlok screws, staggered maybe 12" o.c. The new purlins don't have to extend the entire span, maybe a foot short. I'm not an engineer, and I take no responsibility; like I said it's how I would do it.

Only an engineer is licensed to design alterations to truss structures. Those are bad enough that I would not be occupying that building until it had been inspected by an engineer, and repaired by a professional. Your insurance should be involved in this.

That is a structural roof failure. Insurance. Engineer.