Complex sentence: Taking place during Buffy's third season, Faith and Buffy are the current Slayers and when mayhem caused by tidal waves and burning forests begin to erupt in Sunnydale as well as vicious attackers appearing with ceremonial axes, the gang knows that something is up.
Split into simpler sentences: Taking place during Buffy's third season, Faith and Buffy are the current Slayers. When mayhem caused by tidal waves and burning forests begin to erupt in Sunnydale as well as vicious attackers appearing with ceremonial axes, the gang knows that something is up.