So last Tuesday and Thursday evening C1 Objective were working hard on relative clauses and everything that entails. They finished the week by making a very useful presentation (edited a teensy bit by me to give you some examples).
Here you have a powerpoint presentation:c1-relative-clauses
Here you have a keynote presentation: c1-relative-clauses
And last, but by no means least, a trusty pdf version: c1-relative-clauses