Complex sentence: These efforts were put forth between the early 1910's to the mid 1930's, and by 1937 an exhausted Salvador made one attempt to sell a reel of his raw footage to the Public Education Ministry.
Split into simpler sentences: These efforts were put forth between the early 1910's to the mid 1930's. By 1937, an exhausted Salvador made one attempt to sell a reel of his raw footage to the Public Education Ministry.