Complex sentence: Broad had been associated with Leicestershire since he was 8 years old, having represented them at Under-9 level, though he learnt most of his adult cricket at Melton Mowbray club Egerton Park, which also produced England seamer Tim Munton.
Split into simpler sentences: Broad had been associated with Leicestershire since he was 8 years old having represented them at Under-9 level. Broad learned most of his adult cricket at Melton Mowbray club Egerton Park who also produced England seamer Tim Munton.