Complex sentence: Financing the flight was to be a major challenge for Lindbergh beginning only with $2,000 of his own money derived from his savings and $175 bi-weekly salary earned flying the U.S. Air Mail for RAC.
Split into simpler sentences: Financing the flight was to be a major challenge for Lindbergh. Beginning with $2,000 of his own money derived from his savings and $175 bi-weekly salary earned flying the U.S. Air Mail for RAC.