Complex sentence: Current Indonesian vehicle plates share the legacy of the Dutch colonial era, which do not reflect the current regional divisions of the country into provinces, but the old system of "Karesidenan" regions or regencies.
Split into simpler sentences: Current Indonesian vehicle plates share the legacy of the Dutch colonial era. They do not reflect the current regional divisions of the country into provinces, but rather maintain the old system of Dutch "Karesidenan" regions or regencies.