Complex sentence: The site tagline was "Catch up on the last 7 days of BBC TV & Radio", reflecting that programmes were unavailable on iPlayer after this time (with some exceptions), which was later changed to "Making the unmissable, unmissable".
Split into simpler sentences: The site tagline was "Catch up on the last 7 days of BBC TV & Radio", reflecting that programmes were unavailable on iPlayer after this time (with some exceptions). The marketing slogan was later changed to "Making the unmissable, unmissable".