You can write it as $\sqrt[c]{a^b}=\sqrt[c]{a}^b=(a^{\frac{1}{c}})^b=a^{b/c}$. There isn't really any other way to simplify it, unless there's some context to your question.
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You may be able to reduce the fraction, but once so reduced, if still a fraction, then no, unless you express the denominator $c$ as the $c$th root of $a^b$.
You can write it as $\sqrt[c]{a^b}=\sqrt[c]{a}^b=(a^{\frac{1}{c}})^b=a^{b/c}$. There isn't really any other way to simplify it, unless there's some context to your question.