The SimaPro csv files are not at all tables, but rather "telegram style": you have keywords and then some information and then an "end" to indicate that a next section comes, e.g. "process" starts a process data set. You can check this when you export a csv from SimaPro. It is indeed a bit tricky, the whole format is not - to my knowledge - documented anywhere, and changes a bit over the years, from version to version. We have built the import looking at export csv examples, with supoprt from PRĂ© when we were still reselling SimaPro.