Complex sentence: It echoes a number of the motifs of his earlier works while marking an advancement in his ability in handling depth of space, and establishes iconographic elements of Marian portraiture that were to become widespread by the latter half of the 15th century.
Split into simpler sentences: It echoes a number of the motifs of his earlier works while marking an advancement in his ability in handling depth of space. It establishes a number of iconographic elements of Marian portraiture that were to become widespread by the latter half of the 15th century.