Complex sentence: Under the gimmick, he portrays a suspenseful, overly concentrated ballroom dancer who's fussy and exacting, especially with regards to how his ring name is to be pronounced.
Split into simpler sentences: Under the gimmick, he portrays a suspenseful, overly concentrated ballroom dancer. Central to the gimmick, he is fussy and exacting especially with regards to how his ring name is to be pronounced.