These days, parents treat their children more like adults than before, and children are given more freedom than ever to make their own life choices.
Literal
Recently, parents [topic-は] children [obj-を] before [than-より] more adult [as-として] treat-[conjunctive-い], children [to-には] self [with-で] life [gen-上の] choices [obj-を] do freedom [subj-が] until-now [more-than-以上に] given-[passive-ている].
以前より 'more than before' and 今まで以上に 'more than ever / beyond what has been' set up two comparative frames. ~として 'as / in the role of' marks 大人 as the capacity in which children are treated. 扱い is the conjunctive masu-stem of 扱う, chaining clauses in written style. A well-structured sociological observation sentence.