问个英语句子的语法问题

1. 我问了一下外教，他给出的比较正统的解释是：complex修饰的是issues而非moral & practical，二者并列修饰issues。例如你分别将complex或moral & practical去掉，不影响整句表意。
2. 另：即便修饰moral & practical也是可接受的。山无定势，水无定形。虽说语法约定形容词应由副词修饰，但语言是有鲜活的生命力的，词性变换是行文作赋、日常会话之常态。

啊，那个那个moral还有名词词性的，此处就是
还有形容词的确不能修饰形容词的

There are many such examples:
Today is a nice sunny day.
Seaside people enjoy their great white beaches.
This is a very difficult analytical problems.
She looks beautiful in simple black dresses.
A narrow zigzag path goes to the town.

These three adjectives are parallel to one another. They all modify the noun "issues".

就像"You are a beautiful, kind and humble person."这句的三个形容词一样。

Of course.上面三个是并列的形容词