sentences:  He was a premature baby, and had to spend more than a year and a half in an incubator.Chiyotenzan made his professional debut in March 1991, joining the Kokonoe stable that was then home to "yokozuna" Chiyonofuji and Hokutoumi.He reached the second highest "jūryō" division in January 1997, and the top "makuuchi" division two years after that.