In the story Jamaican fragment how effective is the technique used by the author in creating suspensevin the story? ​

there is no passage what do you mean?

give me the passage and i will answer your question

sentence lenght varies according to word choice.you select which word to use and that will require to use other expressions that collocate with the word chosen.sentence length will vary   according to the choice of words you make to express your ideas.  

uhh i would say.. 100 years or innovation?

many is the pronoun that is used in this sentence. many is a quantifier that determines the amount of discoveries. when we use quatifiers followed by nouns, they act as determiners, but when they are used without a noun, as it is this case, they are pronouns.