いい感じに分かれているって英語でなんて言うの？

ご質問ありがとうございます。 「いい感じに分かれている」はIt's divided wellとかThere's a good diversityとかThere's a good mixtureなどに訳せます。Hitomi様の説明文により、There's a good diversityとThere's a good mixtureがぴったりだと思います。 例文：Japanese people aren't focused on one particular sport. Instead, there's a good mixture in the number of people doing different sports. Japanese people aren't focused on one particular sport. Instead, the number of people doing different sports is evenly divided. ご参考いただければ幸いです。