Complex sentence: In 1988, a port of "Solomon's Key" was made for the "Sega Master System" in Japan and a port for the Nintendo Game Boy system entitled "Solomon's Club" was released in 1991.
Split into simpler sentences: In 1988, a port of "Solomon's Key" was made for the "Sega Master System" in Japan. A port for the Nintendo Game Boy system entitled "Solomon's Club" was released in 1991.