Complex sentence: The sourcemod's popularity increased after the popular YouTube-Gamer SeaNanners started a hidden gameplay series then other Youtuber's soon followed making they're own gameplay's and then started to make the game trend in the youtube community.
Split into simpler sentences: The sourcemod's popularity increased after the popular YouTube-Gamer SeaNanners started a Hidden gameplay series. Subsequently, other Youtubers soon followed, making their own gameplays and then started to make the game trend in the Youtube community.