Complex sentence: A year and half later, Future Trunks manages to go into the present timeline using the Time Machine, however, Goku Black also finds a way to follow Trunks into the same timeline using the Time Ring.
Split into simpler sentences: A year and half later, Future Trunks manages to go into the present timeline using the Time Machine. However, Goku Black also finds a way to follow Trunks into the same timeline using the Time Ring.