合う => do something together N3
を中心に => focused on; centered on~ N2
~こと請け合い => I guarantee ... N1
Happens next
[合「あ」]う => To do A together/mutually N4
Secondary Verb
場合(は) => in the event of; in the case that ~ N4
~ににあわず (に似合わず ) => ~Different from N1
Evaluate
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
一体 => …the heck; …in the world; …on earth N3
中 => While (Lasting) N3
Continuous
~からなる(成る)      => Consists of; formed to N2
に[反「はん」]して/に[反「はん」]し/に[反「はん」]する/に[反「はん」]した => In contrast to A N2
Contrast,Surprise
... 反対に => on the contrary N3
Compare