The excerpt below is from David Wyllie's translation of Kafka's The Metamorphosis:
Was it really not enough to let one of the trainees make enquiries - assuming enquiries were even necessary - did the chief clerk have to come himself, and did they have to show the whole, innocent family that this was so suspicious that only the chief clerk could be trusted to have the wisdom to investigate it? And more because these thoughts had made him upset than through any proper decision, he swang himself with all his force out of the bed. There was a loud thump, but it wasn't really a loud noise. His fall was softened a little by the carpet, and Gregor's back was also more elastic than he had thought, which made the sound muffled and not too noticeable. He had not held his head carefully enough, though, and hit it as he fell; annoyed and in pain, he turned it and rubbed it against the carpet.
I am trying to understand the meaning of the emboldened part. What's the object of "than"? Is the object "through any proper decision"? I thought an object of "than" should only be a noun phrase.
Help me parse and understand the sentence.
Thanks, regards.