。
Please remove the fallen leaves.
Literal
Fallen-leaves [object-を] remove-please.
落葉 ('fallen leaves') is a Sino-Japanese noun compound — compare the native Japanese 落ち葉 (same meaning, different reading: おちば). Both are correct; 落葉 (らくよう) is more bookish. 取り除く is a compound verb combining 取る ('take') + 除く ('exclude/remove').