Complex sentence: As once a wrestler is promoted to "jūryō" he is considered a professional with significant salary and privileges, promotees to "jūryō" are announced just a few days after a preceding tournament, whereas other rankings are not announced for several weeks.
Split into simpler sentences: As once a wrestler is promoted to "jūryō" he is considered a professional with significant salary and privileges. As such, promotees to "jūryō" are announced just a few days after a preceding tournament, whereas other rankings are not announced for several weeks.