No, the second 'it is' is not necessary. You also don't need the comma and I'd recommend using a word such as 'order' rather than 'dictate'. )
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Filha Da PikaHello,Hi Amy,
"It is easier to ask people to do something, than it is to dictate them to do it."
Is the second "it is" necessary for this sentence?