Complex sentence: Mercado later praised the plot saying "They did the 6000th episode really well" and that the key to "Neighbours" staying relevant was to focus less on suburban storylines and more on that type of drama.
Split into simpler sentences: Mercado later praised the plot saying "They did the 6000th episode really well". He added that the key to "Neighbours" staying relevant was to focus more on that type of drama.