verändern
to change
To make something different in its condition, form, or character.
Sie hat ihre Frisur komplett verändert.
She completely changed her hairstyle.

to change
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to change
To make something different in its condition, form, or character.
Sie hat ihre Frisur komplett verändert.
She completely changed her hairstyle.

'Verändern' (to change) is an inseparable verb. The prefix 'ver-' remains firmly attached to the verb stem in all tenses and sentence constructions.
Das Internet hat die Art, wie wir kommunizieren, verändert.
The internet has changed the way we communicate.
Pay attention to the difference: 'etwas verändern' (to change something) means that a person or thing actively causes a change. 'Sich verändern' (to change) means that a person or thing becomes different on its own.
Wir müssen unsere Strategie dringend verändern.
We urgently need to change our strategy.
When something changes, typical subjects are often abstract concepts like 'die Zeiten' (the times), 'die Welt' (the world), 'die Mode' (fashion), or also people and places.
Die Zeiten haben sich seit meiner Jugend stark verändert.
The times have changed a lot since my youth.
to let / to have
'lassen' and 'verändern' form a clear contrast here. 'lassen' means that something stays the way it is. You do not make anything different about it. 'verändern' means that you make something different, for example its form, the plan, or its state. If you want to keep the current state, 'lassen' fits. If something is meant to become different, 'verändern' fits.

Vor der Reise haben wir den Plan noch einmal verändert.
Before the trip, we changed the plan once more.
Wir lassen die Wand weiß, weil der Raum sonst zu dunkel wirkt.
We are leaving the wall white because otherwise the room looks too dark.