Writing Relative Pronouns

<p>I am not understand what’s the error in relative pronouns.
I tried looking at videos and silverturtle guide, but i still don’t get it.
Anyone can explain it to me</p>

<p>Does this help? <a href=“Purdue OWL® - Purdue OWL® - Purdue University”>Purdue OWL® - Purdue OWL® - Purdue University;
And this: <a href=“Purdue OWL® - Purdue OWL® - Purdue University”>Purdue OWL® - Purdue OWL® - Purdue University;