Complex sentence: In June 2014, JMicron announced the JMF670 and JMF670H, which are both 4-channel SATA SSD controllers capable of supporting up to 512 GB storage capacity.
Split into simpler sentences: In June 2014, JMicron announced the JMF670 and JMF670H. Both are 4-channel SATA SSD controllers capable of supporting up to 512 GB of storage capacity.