Complex sentence: During this time, Robo ponders the existence of an "entity", a dying being who wished Crono and his friends to witness its life throughout time, at the end of this side quest the beginning of another side quest involving Lucca is started.
Split into simpler sentences: During this time, Robo ponders the existence of an "entity", a dying being who wished Crono and his friends to witness its life throughout time. At the end of this side quest, the beginning of another side quest involving Lucca is started.