Simplify the following text for a Grade 13 native English-speaking person.
Original: Fabbri was a long time and prolific contributor to the anarchist press in Europe and later South America , including co-editing , along with Errico Malatesta , the paper L'Agitazione .
Simplified: Fabbri was a long time supporter of to the anarchist press in Europe and later South America , including co-editing , with Errico Malatesta , the paper L'Agitazione .