Here is the item again:
Given 1,000 dollars as a graduation gift, Kris wavered between using the
money for a new computer or going to Germany to visit his
sister,
finally Fräuleins and beer won out over graphic cards and RAM.
The comma between sister and finally illegally joins two main clauses. The first main clause begins with Kris wavered ... . The second main clause is finally Fräuleins and beer won out over graphic cards and RAM. To join two main clauses with a comma is to create a comma splice, a major error in sentence structure.
To fix the problem, you could use a semicolon between sister and finally. Then add a comma after finally.