Violent crime has spread to the suburbs as well.

Literal

Violent-crime [topic-は] suburbs [to-にも] spread.

暴力犯罪 ('violent crime') is a compound. 郊外 ('suburb, outskirts'). 広がる ('to spread, to extend') is intransitive. にも ('to [X] also, even to [X]') marks the target with additive emphasis. A news-style social observation.