以外 => with the exception of; excepting ~ N2
的 => about (change noun into na-adjective or adverb) N3
を中心に => focused on; centered on~ N2
…以外(いがい)に…ない => with the exception of; excepting ~ N4
Limit
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous