Complex sentence: Unlike μ's and Aqours, the girls from Nijigasaki Academy are not a group, but rather individual school idols who compete with each other; a popularity poll is held every month to determine their rank.
Split into simpler sentences: Unlike μ's and Aqours, the girls from Nijigasaki Academy are not a group, but rather an individual school idols who compete with each other. A popularity poll is held every month to determine their rank.