Help me look at the English structure …

What is worrying is that the society is medicalizing more and more behavioral problems, and the earlier and harsher generations are usually interpreted as weak-willed behaviors and defined as addiction.

It: formal subject;

Is: predicate;

Worrying: predicative;

Society is medicalizing more and more behavioral problems: logical subject;

Usually defined as addiction: now participle phrases are used as insertion adverbials;

The early Stern generation interpreted it as a weak-willed thing: modifying an addictive appositive clause, in which the weak-willed one is a supplement to the explained object, and the object is a behavioral problem (omitted).

The whole sentence means:

The whole society is increasingly using medical means to deal with behavioral problems (obstacles) and defining it as addiction, which is worrying, but the older generation or more traditional and conservative people think this is a sign of weak will.