Complex sentence: Amir is also obsessed with fast food chain McDonald's, especially with their Chicken McNuggets; he is unhealthy, doesn't do any work, and can't do basic math. He can also act very aggressive or physically abusive towards his co-workers.
Split into simpler sentences: Amir is also obsessed with fast food chain McDonald's, especially with their Chicken McNuggets. He is unhealthy, doesn't do any work, and can't do basic math. He can also act very aggressive or physically abusive towards his co-workers.