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?