On an almost daily basis the Sboats transported troops from Stavanger to Bergen on 181904 five boats were involved therein S 19 S 22 S23 S 24 and S 25

Could you correct the punctuation please?
On an almost daily basis the S-boats transported troops from Stavanger to Bergen, on 18./19.04. five boats were involved therein, "S 19", "S 22", "S23", "S 24" and "S 25".