JS7259, a Form 1099-R with the IRA/SEP/SIMPLE box marked indicates a distribution from a traditional IRA, not from a 401(k). The code 2 suggests that this distribution was for a Roth conversion from a traditional IRA. The Form 1099-R from the 401(k) also indicates that you did not do a split rollover, but instead did a single rollover and a subsequent Roth conversion. The subsequent Roth conversion reported on the code 2 Form 1099-R with the IRA/SEP/SIMPLE box marked ends up being largely taxable, with the nontaxable amount and taxable amounts calculated on Form 8606 (what your were trying to avoid by doing a split rollover) and a substantial portion of your after-tax basis remaining in your traditional IRAs to be applied to reduce the taxable amount of future distributions.
