を中心に => focused on; centered on~ N2
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
使役形 => Causative form N4
的 => about (change noun into na-adjective or adverb) N3
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
[使「し」][役「えき」] => Coercive, permission, allow, make N4
Causative, Passive, Volitional
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