Complex sentence: Goku Black appears in' "Future Trunks Special Edition" attempting to kill Trunks but being prevented by Mai's intervention, this appearance taking place before his initial appearance in "Dragon Ball Super".
Split into simpler sentences: Goku Black appears in' "Future Trunks Special Edition" attempting to kill Trunks, but being prevented by Mai's intervention. This appearance takes place before his initial appearance in "Dragon Ball Super".