Complex sentence: The SG-1000 was test marketed in Japan in 1981 and first released to the Japanese market in July 15,1983, funnily enough, the exact same day the NES was released in Japan, for ¥15,000.
Split into simpler sentences: The SG-1000 was test marketed in Japan in 1981 and first released to the Japanese market in July 15,1983. Coincidentally, this is the exact same day that the Nintendo Famicom (Nintendo Entertainment System) was released in Japan, for ¥15,000.