Complex sentence: McCollum and Davis ultimately received credit because they submitted their paper three weeks before Mendel and Osborne, and both papers appeared in the same issue of the "Journal of Biological Chemistry" in 1913.
Split into simpler sentences: McCollum and Davis ultimately received credit because they submitted their paper three weeks before Mendel and Osborne. Both papers appeared in the same issue of the "Journal of Biological Chemistry" in 1913.