Complex sentence: The Shuttle is criticized both for adopting a simpler, compromise design than was originally envisioned, and also for being overly complex or excessively pushing the state of early 1970s technology.
Split into simpler sentences: The Shuttle is sometimes criticized for adopting a simpler, compromise design than was originally envisioned. Ironically it is also criticized for being "too" complex or excessively pushing the state of early 1970s technology.