Complex sentence: Bolton School is one of the oldest schools in Lancashire; established as Bolton Grammar School, it is not known exactly when the boys' school was founded, though it is recorded as being a going concern as early as 1516.
Split into simpler sentences: Bolton School is one of the oldest schools in Lancashire. Established as Bolton Grammar School, it is not known exactly when the boys' school was founded, though it is recorded as being a going concern as early as 1516.