Complex sentence: Graffiti vandals who are apprehended and convicted are often given community service in the form of cleaning up graffiti around the city, since its inception over 3,000 such graffiti artists have gone through the community service program under the supervision of the Graffiti Abatement Team.
Split into simpler sentences: Graffiti vandals who are apprehended and convicted are often given community service in the form of cleaning up graffiti around the city. Since its inception, over 3,000 graffiti artists have gone through the community service program under the supervision of the Graffiti Abatement Team.