Complex sentence: Two mini-series were published, the first being a four-issue run, the second, a three-issue run subtitled "Forward to the Future" and a "Special" issue was also released, reprinting parts of the first mini-series' first issue.
Split into simpler sentences: Two mini-series were published, the first being a four-issue run; the second, a three-issue run subtitled "Forward to the Future". A "Special" issue was also released, reprinting parts of the first mini-series' first issue.