Complex sentence: The instrument was expanded again to its current configuration and size in 1927--1928 by the Skinner Organ Company of Boston as its Opus 722, under the direction of Ernest M. Skinner and his new Superintendent, recently arrived from England, G. Donald Harrison.
Split into simpler sentences: The instrument was expanded again to its current configuration and size in 1927-1928 by the Skinner Organ Company of Boston as Skinner (Op.722). The work was directed both by Ernest M. Skinner, and his new Superintendent, recently from England, Mr. G. Donald Harrison.