Complex sentence: A subsequent version also supported access to SNA networks, initially only by application programs using VTAM and later by application programs using Telecommunications Access Method (TCAM), and was the basis for the subsequent versions that ran on an IBM 3704,3705, IBM 3725.
Split into simpler sentences: A subsequent version also supported access to SNA networks, initially only by application programs using VTAM and later by application programs using Telecommunications Access Method (TCAM). This was the basis for the subsequent versions that ran on an IBM 3704,3705, IBM 3725.