Question

Me podeis poner un ejemplo de una redaccion utilizando el relative clauses

Answer 1

Defining and Non-defining

A defining relative clause tells which noun we are talking about:

I like the woman who lives next door.
(If I don't say 'who lives next door', then we don't know which woman I mean).

A non-defining relative clause gives us extra information about something. We don't need this information to understand the sentence.

I live in London, which has some fantastic parks.
(Everybody knows where London is, so 'which has some fantastic parks' is extra information). 
http://www.perfect-english-grammar.com/relative-clauses.html