Which that of cause is wonderful news.语法

中间应该是of course当然 不然不太通唉.这句话翻译过来就是,那个,当然,是个好消息.断句是which that,of course,is wonderful news.这样的话,这应该是半句话,that是主语,代指前文说的news；which 表示这句话是从句.造句可以这样造：i brought u one good news and one bad news.first,ur sister just got engaged,which that,of course,is wonderful news.however,her fiancee[未婚夫]simply disappeared right after the engagement.