【问题(1)】that life is full of dreams and having a good dream is of great importance in our daily life整个是看作主语从句吗？

解答:that life is full of dreams and having a good dream is of great importance in our daily life整个是主语从句

【问题(2)】有点疑惑and having a good dream is of great importance in our daily life属不属于主语从句的内容？

解答:and having a good dream is of great importance in our daily life和前面的分句life is full of dreams都是主语从句里面的内容。

句子整体框架结构为:It is well known that 分句A +and+ 分句B

句子整体语法结构分析如下供网友参考

It【形式主语】//is 【系动词】//well known【表语】// that life is full of dreams and having a good dream is of great importance in our daily life【主语从句】//.

备注(1):that是从属连词引导“主语从句”

备注(2):and是并列连词用来连接嵌套在“主语从句”里面的“2个并列分句”

that主语从句结构分析如下供网友参考

that【从属连词】// life【主语】// is【系动词】// full of dreams 【表语】// and【并列连词】// having a good dream【主语】// is【系动词】//  of great importance in our daily life【表语】// 

备注:that主语从句里包含由并列连词连接的分句A和分句B

分句A: life【主语】//  is【系动词】// full of dreams【表语】//

分句B:having a good dream【主语】// is【系动词】// of great importance in our daily life【表语】// 

并列连词:and

备注:分句B里的主语为动名词短语having a good dream充当。