Simplify the following text for a Grade 2 native English-speaking person.
Original: Su Ã nico hijo was originally meant to be the introduction to a trilogy , but aside from an outline and a few fragments of the two sequels , Su Ã nico hijo was ClarÃ n 's last full-length novel .
Simplified: Su Ã nico hijo was ClarÃ n 's last long book .