Complex sentence: Arsenal's pre-season transfers started as early as 30 April 2012, when Arsenal announced they were going to sign German international Lukas Podolski from Cologne for an undisclosed fee, thought to be around £10.9 million.
Split into simpler sentences: Arsenal's pre-season transfers started as early as 30 April 2012, when Arsenal announced they were going to sign German international Lukas Podolski from 1. FC Köln for an undisclosed fee, thought to be around £10.9 million.