I bought this house 3 years ago. I don’t know if this damage is recent or the home inspector missed it. A huge nail penetrates the truss and causing the gap to be widely open. How do i fix the fracture? If I hire someone to fix it, should I call a roofing company? How much does it cost normally?
While the symptoms of your situation appear different, your issue is the same as in Do I need to address a gap between rafter and ridge board? You would want to reinforce the rafter end so it's better supported by the ridge board and opposing rafter.
Jack the rafter up in line with the rest of them. Place a heavy timber across multiple ceiling joists so you don't overstress just one of them. You can probably do this by simply driving a leg under the rafter. You don't necessarily need an actual jack, and using one might be challenging in an attic. Because the roof deck has been sagged for some time, you may not be able to get it perfectly flat without making crunchy sounds. Find a good compromise.
Add a scab. It should be at least 36" long and fastened well with 3" nails or 2½" construction screws, and optionally construction adhesive. Use the "plumb cut" edge of your square for the top cut, according to your roof pitch. The bottom cut can simply be square.
If this strikes you as an overwhelming prospect, you'd hire a carpenter. Most roofers don't do framing (or don't have the knowledge to do it well). The biggest danger in the project is you injuring yourself or falling through your ceiling. You aren't going to hurt your house.
I would install a tie plate to one side and sister the other side. I am going to make this answer that short because your rafter distances seem quite short and literally you could do nothing and your roof would be fine 99.9% of the time.
