Complex sentence: From 1903 to 1904 and from 1905 to 1907, he traveled to the Philippines; he had to interrupt his journey in 1904 because he came down with a parasitic disease.
Split into simpler sentences: From 1903 to 1904 and 1905 to 1907, he traveled to the Philippines. He had to interrupt his journey in 1904 because he came down with a parasitic disease.