非行、学校嫌い、人格の未発達などの問題が現在以上に顕在化してくることが懸念される。

、、。

There are concerns that problems such as delinquency, school avoidance, and underdeveloped personality will become even more visible than they are now.

Literal

Delinquency, school-dislike, personality undevelopment [such as-などの] problems [subject-が] now-more-than visible-become [nominalizer-こと] [subject-が] is-feared.

A complex, formal sentence about social problems. 懸念される means 'to be feared/of concern.' 顕在化してくる means 'to become visible/manifest.' ~など lists examples non-exhaustively. The sentence reads like a report or policy document.