I dont see what your question is?? do you have to answer the question or translate it?
The practice captured the readers interest.
Answer:
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: