This sentence is a complex sentence, since it consists of one independent clause - <em>the various laws ... leave women very little more liberty or power, in some respects, than the slave, </em>and one dependent clause - <em>which I have transcribed. </em>
i'm not sure what the question is. If it is to correct the grammar given, then it would be Mario and Judith <u>a</u><u>r</u><u>e</u><u> </u>studying for <u>a</u><u>n</u><u> </u>upcoming science exam.