How does a long adjective become a pronoun ? Help asa

As with the short forms of su(s), long-form possessive adjectives and pronouns may be clarified in the third- person forms. For adjectives, the long form suyo/a(s) can be replaced by the construction de + pronoun in order to clarify the identity of the possessor. —Their host is arriving now.

Explanation:

1st mi opinión sobre las corridas de toros es que no estoy de acuerdo con esto ya que les hacen daño a los toros.

2nd no, no asistiría.

3rd porque no estoy de acuerdo con las corridas de toros, si estuviera en mexico o en españa prefiriria ir a distraerme a otros lugares.

4th questio..   i think this question you have to answer your since i do not know about your culture. sorry