Complex sentence: In 1991, Paterson invited freelance studio engineer Andy Falconer to join the Orb and was closely followed by energetic studio engineer Kris "Thrash" Weston.
Split into simpler sentences: In 1991, Paterson invited freelance studio engineer Andy Falconer to join the Orb. He was closely followed by studio engineer Kris "Thrash" Weston.