Simplify the following text for a Grade 9 native English-speaking person.
Original: Some authors , such as Peter Paul Wiplinger , have already several books with Arovell , but others use the publishing house as a platform to publish their first book ( s ) .
Simplified: Some authors , such as Peter Paul Wiplinger , have already published several books with Arovell , but others use Arovell to publish their first book ( s ) .