。
Some kids don't like vegetables.
Literal
Vegetable [gen-の] disliking child [also-も] exist.
Two learner-worthy points: 野菜の嫌いな uses の instead of が inside the relative clause (a productive prenominal alternative), and ~もいる is the 'there are also some who...' pattern, used to pick out a subset. The topic is implicit — contrast with other kids implied but unspecified.