Open the document in LibreOffice, and SaveAs HTML Document (Writer). Close LibreOffice
Now open the document in a text editor, such as Notepad++, and remove any Class=classname phrases (WordPress will not know about LibreOffice classes) and any width=xxx.
Select all the text, including the tags , between <table … and … /table>. Paste this into a new page in text mode. Do not edit in visual mode, because wordpress will try to add new fixed column widths.
But, given the tiny page width that WordPress.com allows, is a table appropriate? Perhaps it would be better to just paste the text, in paragraph format. Easier by far to edit in visual mode