Complex sentence: Peter failed his 11 plus so attended Burngreave Secondary School for one year and he then passed the exam for Sheffield Central Technical College and he left three years later at the age of 15 with a 4th grade Technical Diploma.
Split into simpler sentences: Peter failed his 11 plus and so attended Burngreave Secondary School for one year. He then passed the exam for Sheffield Central Technical College and he left three years later at the age of 15 with a 4th grade Technical Diploma.