Complex sentence: A "renaissance" of cave building began in 1972 when Alf Burtleson Construction started the rehabilitation of the old Beringer wine caves, and was followed by the design and construction of new caves.
Split into simpler sentences: A "renaissance" of cave building began in 1972, when Alf Burtleson Construction started the rehabilitation of the old Beringer wine caves. This was soon followed by the design and construction of new caves.