Complex sentence: He was a head boy at Lechwe School, where he did his secondary schooling and A-level and at just 18 years old, he single-handedly fund-raised K2.5 million as part of his school's Community Service Club.
Split into simpler sentences: He was a head boy at Lechwe School, where he did his secondary schooling and A-level. When he was 18 years old, he single-handedly raised K2.5 million as part of his school's Community Service Club.