Breakdown of zuroku o kaimashita.

Questions & Answers about zuroku o kaimashita.
It is usually read ずろく.
A 図録 is often a catalog with pictures, especially for an art exhibition, museum show, or collection. It is a noun.
を marks the direct object of the verb.
In 図録を買いました, the thing being bought is 図録, so を shows that 図録 is what the action of buyう / 買う is acting on.
A natural English gloss is:
- [I] bought a catalog.
買いました is the polite past form of 買う.
- dictionary form: 買う = to buy
- plain past: 買った = bought
- polite past: 買いました = bought
So this sentence is polite and neutral in tone. It is the kind of form you would use in normal conversation, with strangers, in class, or in many written examples for learners.