Relative Clauses

http://www.myenglishpages.com/site_php_files/grammar-lesson-relative-clauses.php

Some nice pages of relative clauses with exercises

Relative clauses

Here is a link to some help with relative clauses and some exercises
http://www.espressoenglish.net/relative-clauses-exercises/

And an explanation in Spanish: http://www.ejerciciodeingles.com/oraciones-subordinadas-relativas-ingles/

More relative clauses

This is one of several great exercises on relative clauses
http://www.perfect-english-grammar.com/relative-clauses-exercise-4.html