Complex sentence: MicroProse, a leading video game developer from the 1980s, was originally based in Hunt Valley, as was Maryland Specialty Wire, a manufacturer of stainless steel wire for over fifty years, until its closure in 2003.
Split into simpler sentences: MicroProse, a leading video game developer from the 1980s, was originally based in Hunt Valley. The former home of Maryland Specialty Wire, which was a manufacturer of stainless steel wire for over fifty years, until it's closure in 2003.