Just peruse through a few threads here at FR and you'll see adults post messages at a 9 yr. old reading level. The misspelled words and punctuation errors are legion.
I doubt the Chinese language is clumsy to the Chinese. : ),
English has its origins in the old Western Germanic language and then saw an influx of Old Norse words with the Viking invasions and subsequent settlements. The Norman invasion in 1066 had its influences that can still hear today in the modern English vocabulary.
During the Renaissance, Latin and Ancient Greek supplanted Norman and French as the main source of new words. As result English developed into very much a "borrowing" language with an enormously disparate vocabulary. Of course we in America have added even more words to our vocabulary borrowed from the various immigrant groups over the years; Italians, Eastern Europeans, Latinos, etc.
Modern English is a very rich and dynamic language but that is also what makes it difficult to learn, speak and write correctly and also what makes it difficult to translate from other languages.
I’m not a linguist nor do I know a lot about the Chinese language but as I understand, the Chinese language, while it has many dialects, has not changed much over time and does not have near as many words in common usage or as many words with similar but not quite the same meaning or words that sound the same but have completely different meanings as does English. And that makes for some very unintentionally humorous translations.