Complex sentence: Declan Lowney returned to directed the first two episodes, and followed by Mark Mylod for Episodes 3 and 4, and Nigel Cole for Episodes 5 and 6.
Split into simpler sentences: Declan Lowney returned to directed the first two episodes. He was followed by Mark Mylod for Episodes 3 and 4, and Nigel Cole for Episodes 5 and 6.