去年在中国

我住过中国一年。(You should use prep. here ex.我在中国住过一年。）

去年我在一个大学教英文了。去年我跟中国人提足球。(In these two sentences, “去年”are repeated. And you don't need to add "了" at the end of the first sentence. In addition,“提”is a wrong word here. The right version：去年我在一个大学教英文，我和中国人（一起）踢足球。

虽然我想中国好漂亮，中国的天气好热！ （I guess you want to say I think China is beautiful, however,in this sentence "觉得“ is much better than "想” to be the translation of "think”, another version:我觉得中国很漂亮，但中国的天气太热！）

我想学中文因为我要再到中国去。（That's a right question, but maybe there is a better one:我想学中文，因为我想要再去中国。）