然しかる上うえは

conjunction

now that; since it is the case that

Formal written conjunction used to state a reason or premise for a conclusion. Often found in formal arguments, legal texts, or literary prose. Equivalent to 以上は or からには in modern spoken Japanese.

• 然しかる上うえは、この契けい約やくは無む効こうと判はん断だんせざるを得えない。

  Now that this is the case, we must conclude that this contract is invalid.

• 証しょう拠こが揃そろった然しかる上うえは、もはや言いい逃のがれはできない。

  Since the evidence is complete, you can no longer make excuses.