At the simplest level, set up a folder on your WordPress site and use ftp to copy the html files there.
For WordPress it is best to use a folder in wp-content/uploads as that won’t get overwritten or flagged by security software, then you can link to the individual html files
e.g. https://www.papercourt-sc.org.uk/wp-content/uploads/sailwave/club-series/2020-WINTER-AM.html
If you want a more integrated feel - then you have to do a bit of custom coding like we did here
https://www.papercourt-sc.org.uk/results/?base=2020-WINTER-AM.html&dir=club-series