Complex sentence: The conversion into a full-fledged sport, however, occurred in the Netherlands, where the ruleset was standardized and the game was internationally publicized and many countries worldwide started collaborating on the development of the game.
Split into simpler sentences: The conversion into a full-fledged sport, however, occurred in the Netherlands, where the ruleset was standardized. The game was internationally publicized and countries worldwide started collaborating on the development of the game.