Both wings were still attached, it's just very poorly visible here. There are slightly sharper stills out there that more clearly show both are present at this point.

the whole plane is there.

the problem was ice on the wings. they had remarked that they had icing on the wings at -42° and turned on the heaters. then they ran into some precipitation, which froze on the wings. they attempted to climb to 22kft but lost control.

it's likely that had they climbed higher sooner, they would have made it.