How do you identify shift in point of view on incorrect pronoun, the invention of the phonograph machine in 1877 by Thomas Edison, which went on to revolutionize the music industry,

Pronoun “WHICH” has more than one antecedent to which it refer to, thus making it an incorrect or unclear pronoun.

Explanation:

Pronouns are used in place of noun and must refer to its antecedent, i.e. something that is already stated in the sentence.  If there are more than one antecedents in a sentence, then it makes the pronoun either an ambiguous pronoun or unclear/incorrect pronoun.  

The solution is to rephrase/rewrite the sentence or removing the ambiguity to make the reader understand the sentence clearly.

Corrected or Rephrased Sentence 1:  The phonograph machine, which was invented by Thomas Edison in 1877, went on to revolutionize the music industry.  

Corrected or Rephrased Sentence 2:  Thomas Edison invented the phonograph machine in 1877, which went on to revolutionize the music industry.

i don't see any right answer. i don't know english and only math