Complex sentence: The leaves are dark green, palmately compound with five (rarely seven) leaflets, each leaflet 6--17 cm long, with a finely toothed margin and (particularly in spring) downy surfaces.
Split into simpler sentences: The leaves are dark green, palmately compound with five (rarely seven) leaflets. Each leaflet is long, with a finely toothed margin and (particularly in spring) downy surfaces.