Complex sentence: The so-called "olbeas", arcades originally made of wood in the one-time bustling marketplaces attached to both parishes that have endured up to present, were erected at this time too, although reconstructed in the XVIth century.
Split into simpler sentences: The so-called "olbeas" were erected at this time too. These consisted of arcades next to both parishes originally made of wood in the one-time bustling marketplaces, and they have endured up to the present, although reconstructed in the XVIth century.