Complex sentence: It it is Spain's second most important tournament on the ATP tour after the Madrid Masters and the event generally takes place in the last week of April, when temperatures in Barcelona average a daily high of 18ºC.
Split into simpler sentences: It it is Spain ´ s second most important tournament on the ATP tour; the Madrid Masters is the most important. The event generally takes place in the last week of April, when temperatures in Barcelona average a daily high of 18ºC.