The LA Angels acquired De Los Santos in late October of last season. He was an international signing for the Texas Rangers back in 2009. He spent five so-so seasons with the Rangers before he was traded to the Washington Nationals, who decided to use him strictly as a relief pitcher instead of developing him as a starter like the Rangers had been doing.
De Los Santos spent a little over a year with the Nationals before being sent to the Reds. They allowed him to go onto waivers last year, which is when he was claimed by the Angels.