Complex sentence: According to some reports, the team has been organized a year earlier, in 1927, but documentary evidence of this version does not, therefore, accepted the countdown to the year with the official team organization, as there are relevant documents in the archives.
Split into simpler sentences: According to some reports, the team had actually been organized a year earlier, in 1927, but documentary evidence of this version does not exist. Therefore, the accepted version is the countdown to the year was preparatory with the official team organization in 1928, as this matches relevant documents in the archives.