Answer:
The author's purpose in this passage is most likely to inform.
Step-by-step explanation:
Informative texts offer knowledge about something by providing readers with dates, definitions, descriptions, or details of a fact, a phenomenon, a person etc. They are commonly found in certain books, newspapers, magazines, encyclopedias etc. What we have in this passage is an example of informative text. The author's purpose is to give us details about a certain sport - roller skating. He tells us when and how it first started and what changes were made to it.