My German is very complicated
And I think there lies the problem because in German we say: the more complicated you can write/speak the more educated you are. Hence my tendency to try to build complicated sentences in other languages even though I know that it doesn't work that good (or that it's beyond my ability)
It's not so much the "big words" because as you say it depends on your vocabulary. I would like to have lessons that teach me how to have words like "hence" or "therefore" to build longer sentences or to connect ideas/thoughts.
To write/speak in a good manner I believe you should mix long and short sentences, words and the structure of a sentence. For example: I am German. I am a student. I am a woman. I am.. We do learn very early on that you can connect sentences with "and" :
I am German and I am a student. But now I can also distribute information in other ways: I am a female student from Germany
The thing is I am looking for such tools that help me to arrange the information I want to give in different ways.
I know that I have to work on my problem to think so complicated but I believe that there is still something to learn for me in order to sound more sophisticated.
I do agree that you shouldn't use big word just for the sake of it or to write more complicated then you have to. But in some cases in order to express a rather complicated thought it is helpful (especially in the scientific world)