Complex sentence: While in Madrid he negotiated the purchase of land at the corner of calle de Núñez de Balboa and calle de Hermosilla for a British Embassy Church, although the building was not started until 1923; it was dedicated as the Church of St George in 1925.
Split into simpler sentences: While in Madrid he negotiated the purchase of land at the corner of calle de Núñez de Balboa and calle de Hermosilla for a British Embassy Church. Building did not start until 1923, and it was dedicated as the Church of St George in 1925.