Complex sentence: Monotype's original, early digitisation of Bembo was widely seen as unsuccessful, both for looking too light in colour and for failing to match the subtlety of the metal type and phototype, which was released in three different optical sizes for different print sizes.
Split into simpler sentences: Monotype's original, early digitisation of Bembo was widely seen as unsuccessful. This made the proportions of the digital font appear wrong, failing to match the subtlety of the metal type and phototype, which was released in three different optical sizes for different print sizes.