Complex sentence: In May 2012, Virgin Mobile USA began offering 4G products using Sprint's WiMAX network and services, its first 4G phone was the HTC EVO V 4G, was previously also released by Sprint as the HTC EVO 3D.
Split into simpler sentences: In May 2012, Virgin Mobile USA began offering 4G products using Sprint's WiMAX network and services. Its first 4G phone was the HTC EVO V 4G and was also previously released by Sprint as the HTC EVO 3D.