Complex sentence: The owners hired one of the state's most prestigious architects, Joseph Cather Newsom, to desing the structure, and lumber was floated down the coast from Oregon and Norther California on large lumber rafts, and hauled from San Pedro to San Dimas.
Split into simpler sentences: The owners hired one of the state's most prestigious architects, Joseph Cather Newsom, to design the structure. Lumber was floated down the coast from Oregon and Norther California on large lumber rafts, and hauled from San Pedro to San Dimas.