Complex sentence: At this time the "Fábrica de Braço de Prata" had signed a contract to supply the United States Army with artillery ordnance, as such, new facilities were built at the Alcochete field to allow the testing of projectiles.
Split into simpler sentences: At this time the "Fábrica de Braço de Prata" had signed a contract to supply the United States Army with artillery ordnance. As such, new facilities were built at the Alcochete field to allow the testing of projectiles.