Complex sentence: Alex and Marian Weygers relocated to the Monterey Peninsula in the 1960s and settled into their residence in Carmel Valley that served as a home and studio until his death at the age of eighty-seven.
Split into simpler sentences: Alex and Marian Weygers relocated to the Monterey Peninsula in the 1960s and settled into their former retreat in Carmel Valley that then served as their home and studios. This was the location of his death at the age of eighty-seven.