Which* (is spelled with an h” ) = cual ? Witch = bruja 🧙‍♀️ “was” is not the main verb here. The main verb is “say”... we want to know what was said. No entiendo bien su pregunta. Solo hay una oración aquí 🤔

I will try .... There was a concern with public toilets. What were various concerns? Pablo said that they were dirty. Maria said that they do not work. The Nippon Foundation said something. The Nippon Foundation said what? = What did the Nippon Foundation say? What did the Nippon Foundation say (not what did Pablo say and not what did Maria say) was the concern? According to the Nippon Foundation, the concern was ... .

Okay, so yes... it’s referring to something that was said in the past, but it’s kind of like... Let me give you a scenario... A coworker of mine can ask, “Hey Krystal, do you know what was said at the meeting (that occured in the past) ? “ “Hey Krystal, what did our team say at the meeting?” (Here I can still use “say” because in the present moment I want to know what occurred at the (past) meeting) I don’t think I’m helping much, sorry 😅

Hmm pues mi español está limitado, pero “What did they say was the concern?” Es como preguntar “Que dijeron que era la preocupación?” (Alguien puede preguntar esta pregunta en este momento presente, pero están preguntando sobre algo dicho en el pasado, y por eso se suena como que usa diferentes tiempos- ojalá me puedes entender