Complex sentence: In June 1927, Powers made an unsuccessful takeover bid for De Forest's company, in the aftermath of which he hired a former De Forest technician, William Garrity, to produce a cloned version of the Phonofilm sound recording system, which became Powers Cinephone.
Split into simpler sentences: In June 1927, Powers made an unsuccessful takeover bid for De Forest's company. In the aftermath of the failed takeover, Powers hired a former DeForest technician, William Garrity, to produce a cloned version of the Phonofilm sound recording system, which became Powers Cinephone.