Complex sentence: However, Rafeal Benitez has signed players that had already established themselves in Spain and had helped improve the fortunes of their respective clubs, whilst Pique and Fabregas were "poached" from a very young age and had not even been proven in their home country.
Split into simpler sentences: However, Rafeal Benitez has signed players that had already established themselves in Spain and had helped improve the fortunes of their respective clubs. Whilst Pique and Fabregas were "poached" from a very young age and had not even been proven in their home country.