I started writing novels in Japanese lately, [It is better to join two sentences with a comma than to start a second sentence with a conjunction (and, or, but, so, for example).]

and I want my foreign friends to have the chance to read them in English. ["Making" someone do something in English means forcing them to do it whether they want to or not. A simpler change is "I want to let my foreign friends read them in English," but it is not quite as natural in this case. The word "it" needs to be changed to "them" because the word "novels" is plural.]

So I am asking Japanese Lang-8 users who are very good at (using) English (and Japanese) to translate it for me. [Alternative: "So I am asking for translation help from Japanese Lang-8 users who are very good at English."]

Mr. yas, who is Japanese and he is better than me at using English, agreed with my idea and he made up a good suggestion. [Note: The phrase "who is Japanese and is better than me at using English" is all an additional description of "Mr. yas", so there should be a comma both before and after it. Normally, the first letter of a name must be a capital letter, but it is a matter of opinion whether this should be done with a user name at a web site.]

The suggestion is that I call on that English-speaking people to correct his translation of my novel. [Alternative: "The suggestion is that I ask English speakers to correct his translation of my novel."]