Complex sentence: Miquel made his Premier League debut against Liverpool on 20th August, coming on for the injured Laurent Koscielny in the 16th minute as Arsenal lost 2-0 because of his clearance hitting Aaron Ramsey's chest for an own goal.
Split into simpler sentences: Miquel made his Premier League debut against Liverpool on 20th August, coming on for the injured Laurent Koscielny in the 16th minute as Arsenal lost 2-0. The first goal was scored as of his clearance hitting Aaron Ramsey's chest for an own goal.