Complex sentence: Although Muldoon was not billed with the main cast he appeared in most of the fourth season's episodes and is also "Melrose Place" s longest recurring character (i.e. not in the opening credits) in terms of number of episodes.
Split into simpler sentences: Although Muldoon was not billed with the main cast he appeared in most of the fourth season's episodes. He's also "Melrose Place" s longest recurring character in terms of number of episodes.