The present question is that many people consider impossible what is really possible if effort is made.
解析:句子的主语是the present question,谓语是 系动词is,that从句是表语从句,值得关注的是,在that从句中,many people是主语,consider是谓语,画线部分是动词的宾语从句,impossible是宾语补足语,但宾语太长之故,被放置到补足语之后,造成了形式上动词consider和其宾语what从句的分隔,此外,what is really possible if effort is made 相当于all(that is possible if effort is made).
翻译:当前的问题是,许多人把如果付出努力完全有可能做到的事情,视作是不可能的。