Complex sentence: Michal has been associated with many charities and non-profits since the death of his second daughter Michaela which has died on Leukemia at the age of 11, raising large amounts of money and using his public profile to raise awareness of the disease.
Split into simpler sentences: Michal has been associated with many charities and non-profits since the death of his second daughter Michaela which has died on Leukemia at the age of 11. He is raising large amounts of money and using his public profile to raise awareness of the disease.