Firstly, if our lives are void of technology then we shall have the lives of primitive people, like those dwelt in the stone ages, trying to put on fire with stones, travelling hundreds of miles on foot taking weeks to reach their desired destination, no mobile phones, internet facilities, computers, making our learning and education slow.
If this is a topic sentence, I think that it may be too specific or too long.
It may be better for you to divide it into 2 sentences.
The first one is the main idea, which means if we lack technology, we will live like premitive people.
The second one is the developing sentence, which means how difficult the life will be for us if we live like premitive people.
:D