I receive documents that have following formatting

Lorem ipsum sit amet, [consectetuer adipiscing](elit Maecenas porttitor congue massa) usce posuere magn.

I need a macro that will replace whatever is within both the single brackets and the parentheses with enclosure in double brackets, so that the above would become

Lorem ipsum sit amet, [[consectetuer adipiscing]][[elit Maecenas porttitor congue massa) usce posuere magn.]]

Thank you.