Complex sentence: In 2005, Martha Davis performed at Seattle, Washington's Teatro ZinZanni, for which she collaborated with TZ Maestro Norm Durkee to make the special CD "Omnium", which is available only through the Teatro ZinZanni gift shop.
Split into simpler sentences: In 2005, Martha Davis performed at Seattle, Washington's Teatro ZinZanni. For which she collaborated with TZ Maestro Norm Durkee to make the special CD "Omnium" which is available only through their Gift Shop.