Complex sentence: His most famous work, "Concierto de Aranjuez," was composed in 1939 in Paris for the guitarist Regino Sainz de la Maza, and in later life he and his wife declared that it was written as a response to the miscarriage of their first child.
Split into simpler sentences: His most famous work, "Concierto de Aranjuez," was composed in 1939 in Paris for the guitarist Regino Sainz de la Maza. In later life he and his wife declared that it was written as a response to the miscarriage of their first child.