Below is an image from software I wrote a while back. The figures should not be taken as "gospel" because I don't have exact dimensions for your trusses, but it will give you a reasonable estimate of the forces in play.
The compession/tension numbers are in pounds with a 50 lbs/sqft static load and trusses spaced at two feet. The loads on the lower members are tremendous. You've received some good suggestions below. In my opinion, if you can get the ends pulled back together (as someone else suggested) and "splice" some 2x4s around the breaks, you may be able to fix it. I would pre-drill and screw them together (maybe even squeeze some construction adhesive in between before screwing). That lumber is going to be dry and pre-drilling will help with splitting. I would also brace along the bottom from truss to truss (lateral bracing) in at least two places preferably three places to keep the bottoms of those trusses from moving from side to side. It's likely that is what loosened up those gusset plates.
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