Is presented, energetic-characteristics

It is revealed that krogstad was once in love with Kristine Linde, who ended up marrying another man in order to have enough money to support her dying mother and young brorhers. This left him lost and embittered, unhappy in his own marriage, and is presented as the reason behind his moral corruption.

The birds may have many struggles, but they do not show it, much like Nora avoids doing it. Torvald thinks that Nora is energetic-characteristics of the song bird.

Are there any grammatical mistakes?