[Do4Got]

Could you recommend a website where I can check if an email address has been compromised in a data breach?

[DramaKing]

haveibeenpwned.com is probably the most comprehensive.

[Bastille]

https://github.com/khast3x/h8mail > All in one tool

Otheriwse :
https://intelx.io/tools?tab=email

[Hoxen]

To check if you are included in any kind of data breach you should use haveibeenpwned.com
If you want to dig deeper and get the exact leaker information, you may search for the leak in multiple ways:
1- Google is always your friend - Search for txt files/txt pastes/github repos
2- Use services that does all that work for you such as [REMOVED] (You can google it to find some alternative websites if you want)

Remember, avoid using the suggested website for anything illegal as it can reflect bad on you if you don't know what you are doing. (Such as logging in to accounts without fully securing yourself)