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Advanced conditional structures replace "if" with formal alternatives (provided that, unless, as long as, on condition that) or use inversion, adding precision and formality to conditional meaning.
Unless the weather won't improve, we will cancel.
Unless the weather improves, we will cancel. — "Unless" already carries a negative meaning; don't add another negative.
Provided you will finish on time, you can leave.
Provided you finish on time, you can leave. — Use the present simple, not "will," after "provided that."
Unless you hurry, you'll miss the bus.
You can go provided that you finish your homework.