he had incluede a large number offunny stories in the speech and，of couse，it was a great success

of couse是一个插入语，是修饰后面的成功，“当然，他的演讲是成功的”
he had include a large number of funny stories in the speech and it was a great success.追问

and 怎么解释

追答

and 连接的是"he had include a large number of funny stories in the speech"和"it was a great success" 相当于“和，并且”

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