Complex sentence: There is a gap in the age of finds between about 1200 BC and the start of the Roman period in about 70 AD, which may indicate depopulation, possibly due to a poorer climate.
Split into simpler sentences: There is a gap in the age of finds between about 1200 BC and the start of the Roman period in about 70 AD. This may indicate depopulation, possibly due to a poorer climate.