Simplify the following text for a Grade 9 native English-speaking person.
Original: The El Gato Negro characters were created by comic book artist and writer Richard Dominguez , both making their first published appearance in El Gato Negro # 1 ( October 1993 ) published under Dominguez 's own Azteca Productions imprint .
Simplified: Created by Richard Dominguez , both characters made their first appearance in El Gato Negro # 1 .