the tail wagging the dog,這句話是否為which is(形片)之簡句?

A dog ,wagging its tail,-----adj cl-----is moving.
The dog's tail wagged.
=The dog wagged its tail-------sentence
Inverted sentence:-eg:-
A dog, which is(no which(形片) is wagging its tail,----adj cl----is moving..---as you said an adj cl.in a complete sentence.
A dog is wagging its tail------sentence ; as for the inverted sentence:-eg:-the tail wagging the dog as the figure of speech expression gives variety force, using words out of their literal meaning,eg:-a simile or metaphor..

你用中文翻譯英文就明白，「摇晃著尾巴的狗

補充 警察到了跟汽車車主還有第一台機車留了資料就叫他們回去 ，只留後面兩台機車車主留下，請問這樣第一台汽車跟第一台機車會有肇則嗎？