老师，这是我写的一段话，划线句里面是that引导的限制性定语从句和一个on which引导的非限制性定语从句，但是我不确定能不能用and连接这两个定语从句，因为我觉得如果不加and，容易产生歧义，容易看成on which的先行词是mountain。

Since enthusiasts were becoming more, usually resulting in a crowed when ascending, people came up with an idea to build an artificial wall that imitated the surface of a real mountain and on which most of our competitions are held now.