The negotiation of the sale (of the business) depends on whether both companies can mutually agree with the conditions.
The negotiation of the sale (of the business) depends on whether both companies can mutually agree with the conditions.
= 売却交渉の行方は、両社が条件面で折り合えるかによります。
売却交渉 = The negotiation of the sale
〜による = It depends on / It depends if / It depends on whether
条件面で折り合う = Mutually agree with the condition(「条件について同様に同意する」)