Then... Cinelerra? 🤣

Upon seeing the title and initial question, I was going to say "Kdenlive" 😅

So... if that one's too complex... Many years ago I tried Pitivi briefly and I remember it being much simpler (i.e. crappier 😁). No idea about how it has evolved, but it might be suited for your purposes.

For subtitles you might want to consider a proper subtitling tool like SubtitleComposer.

EDIT: Also, LiVES?