Complex sentence: One example is the Bronze Age trackway at Withy Bed Copse, in England; the trackway was built from wood which had clearly been worked for other purposes before being re-used in the trackway; another example is driftwood, which may be used as construction material.
Split into simpler sentences: One example is the Bronze Age trackway at Withy Bed Copse, in England; the trackway was built from wood which had clearly been worked for other purposes before being re-used in the trackway. Another example is driftwood, which may be used as construction material.