Complex sentence: In June 2004, when Hillhurst/Los Feliz LLC purchased The Derby and adjacent lots with a view to demolition and replacement by a condominium complex, the planned redevelopment became a cause celebre for historic preservation activists.
Split into simpler sentences: In June 2004, The Derby and adjacent lots were purchased by Hillhurst/Los Feliz LLC with a view to demolition and replacement by a condominium complex. The planned redevelopment became a cause celebre for historic preservation activists.