Complex sentence: Liphart became an acknowledged expert on the history of art. In 1867 he followed a theory put forward by Gustav Waagen Liphart and was able to recognise that a painting newly arrived in the Uffizi gallery, Annunciation was by Leonardo de Vinci.
Split into simpler sentences: Liphart became an acknowledged expert on the history of art. In 1867 he followed a theory put forward by Gustav Waagen. Liphart was then able to recognise that a painting newly arrived in the Uffizi gallery, Annunciation, was by Leonardo de Vinci.