Complex sentence: However, although they unanimously regarded Andy and Vicky as useless test subjects and dead ends, it was also unanimously agreed that Charlie was a groundbreaking development, and as a result, the McGee family was placed under surveillance for around seven years.
Split into simpler sentences: However, although Andy and Vicky were unanimously regarded useless test subjects and dead ends, it was also agreed that Charlie was a groundbreaking development. As a result, the McGee family was placed under surveillance for around seven years.