Question

谁能帮我分析一下这段英语的结构，句型。

Trying doors as he went, swinging his club with many clever movements,turning now and then to cast his watchful eye down the peaceful street,the officer,with his strongly built form and slight air of superiority ,made a fine picture of a guardian of the peace.The area was one that kept early hours.Now and then you might see the lights of a cigar store or of an all-night lunch counter,but the majority of the doors belonged to business places that had long since closed.

Answer 1

Trying doors as he went, swinging his club with many clever movements,turning now and then to cast his watchful eye down the peaceful street,是伴随状语
the officer,是真正的主语
with his strongly built form and slight air of superiority ,是定语，修饰主语“the officer”
made a fine picture of a guardian of the peace.是句子的谓语部分结构。
以上部分是第一句话。

The area（主语） was （be动词）one（表语） that kept early hours（that从句是修饰one的定语从句）.这是第二句话。

Now and then （状语）you （主语）might see（含有情态动词的谓语动词） the lights of a cigar store or of an all-night lunch counter（or 连接2个并列的名词做see的宾语）,这是第三句话

but the majority of the doors（主语） belonged （谓语）to business places that had long since closed.（that从句是修饰business place的定语从句）
but作为转折连词引起第四句话