Complex sentence: Unicode used separate codepoints that were already in use to maintain round-trip compatibility in conversion, but Unicode never declared full equivalence and the reference glyphs are different for variants like 內 (U +5167) and 内 (U +5185).
Split into simpler sentences: Unicode used separate codepoints that were already in use to maintain round-trip compatibility in conversion. Later though, Unicode never declared full equivalence and the reference glyphs are different for variants like 內 (U +5167) and 内 (U +5185).