I was drafted into the ...谁能帮我分析一下这个句子？

Question

I was drafted into the Army at the end of my junior year and,after four years in the service,had no inclination to return to finish college.这个句子中为什么and 后面要加逗号，为什么不加在其前面呢？第二个逗号后的had是个动词，I后也是有动词was，这样不是一个句子有两个动词了吗？谁能帮我解释一下

Answer 1

after four years in the service这个短语是补充说明的,所以前后用逗号隔开
and是连接was drafted into the Army 和had no inclination to return 这两个动词短语,一起做谓语动词

Answer 2

“after four years in the service”是个插入语，如果把它放到句子最后相信你会看的更清楚，而这个句子是个并列句:I was drafted into …… and had no inclination ……

Answer 3

第一个and后面是一个插入语，可以先抛开不看，与后面的句子就接上了，而这个and链接的是两个并列的句子，所以都有自己的动词，但第二个句子的主语I就省略了，事实上是：I was drafted into the Army at the end of my junior year.I had no inclination to return to finish college.