你的句子中，for example为插入语，解释后面的句子是对前面句子的举例说明。因此主要的信息在前句，后面是次要信息，主次已经分明，就不再需要其他从属标记词。

EMO included spa reports regularly. For example, in  one issue they ranked body services such as the "Detoxifying Algae Wrap " and "Balneotherapy" provided by Tethra Spa in Dublin. 

EMO included spa reports regularly. In one issue, for example, they ranked body services such as the "Detoxifying Algae Wrap " and "Balneotherapy" provided by Tethra Spa in Dublin. 

以上二句中，for example都是连接性状语（conjunct)。