その...その => Every... N1
Happens next
受身形 => Passive voice N4
...そのもの => Myself... N2
Demonstrate by example
そのものだ => exactly ~ N2
Consider it
一方では...他方では => On the one hand N2
Compare
この / その / あの => this / that N5
Spatial relations
~V使役受身      => causative-passive form N4
Conjugate verbs
[受「う」]け[身「み」] => Passive, be V-ed. N4
Causative, Passive, Volitional
そもそもの... => ...First, truly, first of all (due to) N2
Base, base
その上 => besides; in addition; furthermore ~ N3
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
そのうち => some day/some time eventually N3
Short period of time