Complex sentence: Nicieza explained his decision behind giving Machin's mantle as Anarky to another character was due to his desire to establish an archnemesis for Tim Drake, while respecting the original characterization of Anarky, who Nicieza recognized as neither immature, nor a villain.
Split into simpler sentences: Nicieza explained his decision behind giving Machin's mantle as Anarky to another character was due to his desire to establish an archnemesis for Tim Drake. However, in an effort to respect the original characterization of Anarky, it was necessary that it not be Machin, who Nicieza recognized as neither immature, nor a villain.