Complex sentence: As Epsilon Aurigae attracted more attention, more and more data was compiled; sorting through the observational data revealed that Epsilon Aurigae did not just vary over long periods of time, but also experienced short-term variations in brightness as well.
Split into simpler sentences: As Epsilon Aurigae attracted more attention, more and more data was compiled. The observational data revealed that Epsilon Aurigae did not just vary over long periods of time, but also experienced short-term variations in brightness as well.