求助英语句子结构问题.“Because it has this advantage,it has received gr

求助英语句子结构问题.“Because it has this advantage,it has received great attention."
上面句子中,两个分句的主语都是代词it.如果把其中一个分句中的it改为具体所指的事物的话,最好应该改哪个分句的主语.请给出理由或者语法上的规定.