それはそうと => By the way N2
Miscellaneous
わ => Very, so, already N5
Particles
に[沿「そ」]って/に[沿「そ」]い/に[沿「そ」]う/に[沿「そ」]った => Along with A; In line with A N2
Based, Focused, Depending on
[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
わりに => Considering A, B N2
Considering, Concerning
そうにない => N2
Potential, Possibility
そうだ => Seem, like… N4
Situations and Experiences
わりに => Considering A, B (unexpected) N3
Considering, Concerning
にわたって/にわたり => Over the course of A (continuous action), Throughout A N2
Time, Situation
てこそ => Now since A... N2
Reason, Result, Response
ばこそ => Because of A N1
Reason, Result, Response
それと => A, and B N3
List, Examples