Complex sentence: She appeared in four episodes as businesswoman Hillary Michaels, the mother of Amanda Woodward (played by Heather Locklear), before her character spearheaded the spin-off series "Models Inc.", but the show only lasted a single season.
Split into simpler sentences: She appeared in four episodes as businesswoman Hillary Michaels, the mother of Amanda Woodward (played by Heather Locklear). She played a leading role on the "Melrose Place" spin-off- "Models Inc.", but the show only lasted a single season.