Complex sentence: Tony then realises that Sid is buying too much dope and tries to phone Sid to stop him buying it but Sid buys 3oz for £300 from Mad Twatter but he demands the cash in 48 hours.
Split into simpler sentences: Tony then realises that Sid is buying too much dope and tries to phone Sid to stop him buying it. Sid, however, buys 3oz for £300 from Mad Twatter, who demands the cash within 48 hours.