Barbieova -> proper noun, stays as is. (But "Barbieova" might be possessive form. So "Barbieova" is a proper noun here, so stays.
škola -> akademija (assuming these are correct synonyms in Croatian)
But in their example, they use three variations for each term. So for "Djeca", three options. Let me try to follow that pattern. barbie skola za princeze sinkronizirano
U današnjem dobu, gdje je obrazovanje i zabava sve više isprepleteno, djeca i roditelji traže nove i inovativne načine učenja i razvoja.
: -> punctuation, no change.
"Barbie Skola za princeze sinkronizirano je program koji nudi inovativan pristup obrazovanju i zabavi." The term "sinkronizirano" could be replaced with similar words like "sinhronizirano|sinxronizirano|sincronizirano". "inovativan" might become "novokrevni|inovativni|osvježavajući". "obrazovanju i zabavi" could be rewritten as "školovanju i zabavi|izobrazbi i zabavi|edukaciji i zabavi".
Now next sentence:
i -> i