Complex sentence: SCM includes linkable modules for SLIB features sequence comparison, arrays, records, and byte-number conversions; and modules for POSIX system calls and network sockets, readline, curses, and Xlib.
Split into simpler sentences: SCM includes linkable modules for SLIB features like sequence comparison, arrays, records, and byte-number conversions. SCM also includes modules for POSIX system calls and network sockets, readline, curses, and Xlib.