From Wikipedia
SIMS Co., Ltd. (シムス株式会社, Shimusu Kabushiki-gaisha?), which stands for "Soft development Innovation Multi Success"[1], is a Japanese video game publisher and developer originally established on June 12, 1991 as a joint venture of Sanritsu Denki Co., Ltd. and Sega Enterprises, Ltd. About 50 employees transferred over from Sanritsu[2].
SIMS became independent of the Sega group on June 25, 2004, when Representative Director Noboru Machida took over all stock from the veteran game maker