There are many reasons why you might have problems with complex sentences. Autism is a very broad disorder. If you had autism, you would probably have other problems too.
Some learning disabilities can make it more difficult to understand some kinds of language, either listening or reading.
If this is a big problem for you, you could ask a college counseling center (if you are a college student) or your family doctor for help. They can test to see if you have some kind of learning disability. If you do, they can recommend ways to work around it.
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