Complex sentence: Katy B supported Tinie Tempah on his tour during Spring of 2011, and on 30 April 2011 she embarked on her own debut concert tour throughout Europe until September, then the UK in October.
Split into simpler sentences: Katy B supported Tinie Tempah on his tour during Spring of 2011. On 30 April 2011, Katy embarked on her debut concert tour throughout Europe until September, then the UK in October.