Complex sentence: He is believed to have been a Legionnaire, but explorer David Wynford Carnegie writes of him as being in the French Navy, and there is a photo of him as a private in "A" company, 1st.
Split into simpler sentences: He is believed to have been a Legionnaire, but explorer David Wynford Carnegie writes of him as being in the French Navy. There is a photo of him as a private in "A" company, 1st.