Original sentence: Cooperation in the police field is especially satisfactory for both parties, who collaborate in the fight against illegal immigration, holding meetings on the subject and numerous exchanges, such as participation in various seminars and conferences in Spain by experts of the Nigerian Immigration Service (NIS) and the National Agency for the fight against Trafficking in Persons (NAPTIP)
Edited sentence: Cooperation in the police field is especially satisfactory for both parties, who collaborate very fluently in the fight against illegal immigration, holding meetings on the subject and numerous exchanges, such as participation in various seminars and conferences in Spain by experts of the Nigerian Immigration Service (NIS) and the National Agency for the fight against Trafficking in Persons (NAPTIP)