Complex sentence: Crosley was innovative, personally inventing or funding the development of many then--cutting edge technological advances in his ventures which he placed in the able hands of his younger by two years brother, Lewis Crosley, who was a graduate engineer from the University of Cincinnati.
Split into simpler sentences: Crosley was innovative, personally inventing, or funding the development of, many then--cutting edge technological advances related to his ventures. He placed these in the able hands of his younger brother (by two years) Lewis, who was a graduate engineer from the University of Cincinnati.