vandalism破坏公物的行为;

graffiti涂鸦;

judge法官;

gang(犯罪)团伙;

sent them to prison送他们入狱;

criminal damage刑事损害;

maximum sentence最高刑罚;

got off lightly(被)从轻判决;

got nine months被判九个月的徒刑;

youth detention centre少年拘留所