Complex sentence: The informative process was opened in 11 February 1938 in Troyes and was completed on 15 December 1949 which was followed by a complementary process in Rome July 8th, 1963 through January 13th, 1964.
Split into simpler sentences: The informative process was opened in February 11,1938 in Troyes and was completed on December 15,1949. This was followed by a complementary process in Rome from July 8,1963 through January 13,1964.