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.