Question

(His photos/ sell / in that Gallery/ for years/ by the gallery/ owner)

Answer 1

Respuesta:

Sus fotos / vender / en esa galería / durante años / por la galería / propietario

Answer 2

Respuesta:

His photos have been sold in that gallery for years

Explicación:

The action has continued for years. Use a present perfect form of be + the past participle of sell. The by phrase does not give important information.