1. The fertility ratio will be disfavored which limiDue to the rise of infertility among adults, the number of children a couple will have.birth rate has decreased

"Fertility Ratio" and "Disfavored" seem incorrect and I am not sure what you mean. I believe you wish to say something along the lines of...

"Due to the rise of infertility among adults, the birth rate has decreased"

2. The company's failure was derived from its apparent inability to develop new products and from its irresponsibility toin guaranteeing product quality.

This makes sense but there is no need to repeat "from its".

"The company's failure was derived from its apparent inability to develop new products and its irresponsibility in guaranteeing product quality."

3. The connotationmeaning of this painting is overlooked by many people, since it highlights an aspect of its attitude offten misconstrued. It seeks to highlight how technology that is very different from the traditional picture of prosperous cities where have unlimited convenience to people and leave no privacy at all.s infringed upon a person's privacy

I am not sure what you are trying to convey in this sentence. From my understanding you are trying to say.

1. The true meaning of the painting is often missed by people.
2. The painting highlights how technology has changed cities.
3. Technology leads to infringement of privacy

Putting these three together I believe a suitable sentence is

"The meaning of this painting is often misconstrued. It seeks to highlight how technology has infringed upon a person's privacy."

Sentence 1-–3

This is a VERY tiny thing, but in ranges of numbers, you can use the en dash "–" rather than the hyphen ("-").

1. The fertility ratioe will be disunfavoredable, which will limits the number of children a couple wills can have.

Not entirely sure what you mean by "the fertility ratio will be disfavored." (To be completely honest, although my correction sounds more natural, it still doesn't entirely make sense out of context.) A comma goes before "which" when it's serving as a conjunction.

2. The company's failure is derived from its apparent inability to develop new products and from its irresponsibilityfailure to guarantee product quality.

3. The connotation of this painting is overlooked by many people, since it highlights an aspect of its attitude oftoward technology that, which is very different from the traditional picture of prosperous cities where haveith unlimited convenience to people and leaves no privacy at all.