While The Simpsons is dubbed in many languages like Spanish and Japanese, it is rarely dubbed in Croatian. Consequently, these subtitled "Hrvatski, Engleski" versions are the primary way the show is consumed in the region. Where to Find Subtitles
If you already have the video files and just need the subtitle files (.srt), you can check dedicated subtitle repositories: The Simpsons (1989) Hrvatski, Engleski titlovi
It refers to the original 1989 series created by Matt Groening, which premiered on December 17, 1989, with the Christmas special "Simpsons Roasting on an Open Fire". While The Simpsons is dubbed in many languages