How concerning is this issue?(See Pics)

[Joshua Meyers]

Found a pretty solid deal today and the seller seems motivated. The only problem I've found with the property is this crack/shift. There are no cracks in the walls and all the windows, doors, floors, etc. seem to all be level and close normally. How serious is this issue and can it be repaired? The house is approx 70 yrs old. I know it's hard to judge from pictures alone but I'm just looking for some general opinions. Thanks for the help guys!