"Some specialists consider that it is better for children to learn a foreign language."
" Some specialists consider learning a foreign language beneficial to a child's (brain) development "
Grammatically the first sentence is incorrect. The sentence I provided reads more naturally.
"I considered that the news was false"
Is ok but
"I considered the news to be false."
Is more natural as well
I'm unsure of the rules for sentence structure that you have learned. Sorry if I can't explain it in a way that fits the structure.