Tā bùjǐn shì gēshǒu, gèng shì yī wèi quáncái biǎoyǎnjiā.
He is not just a singer but an all-round entertainer.
Tips
usage
表演家 implies a high level of skill and artistry, more prestigious than 表演者 (performer). The suffix 家 suggests mastery of a craft, as in 艺术家 (artist) or 音乐家 (musician).