This is the 2373rd most frequent Polish word.
zajmował
"Zajmował" means "he/she/it occupied" or "was occupying."
Here, 'zajmował' is used in the context of engaging in or being occupied with a specific activity, indicating past involvement.
Mój brat zajmował się naprawą komputerów.
My brother was taking care of computer repairs.
'Zajmował' in this sentence refers to occupying a role or position, showing past professional engagement.
W przeszłości zajmował stanowisko dyrektora w firmie.
In the past, he held the position of director in the company.
In this case, 'zajmował' is expressing the act of occupying oneself or focusing one's attention on an activity, in this case, reading books.