受身形 => Passive voice N4
中 => While (Lasting) N3
Continuous
途中で/途中に => on the way; in the middle of ~ N4
~V使役受身      => causative-passive form N4
Conjugate verbs
中 => During the period (Term) N3
Time
[受「う」]け[身「み」] => Passive, be V-ed. N4
Causative, Passive, Volitional
を中心に => focused on; centered on~ N2
最中に => while; during; in the middle of ~ N3
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
途中 (は) => on the way; in the middle of ~ N3
Halfway
中 => Throughout, all over, during the course of N5
Time
(の中)で~が一番~です => out of this group, [A] is best N5