Complex sentence: Two Eurofighter Typhoons were on exercise with the Learjet in the Elpe-Olsberg area when one of them hit the Learjet, which consequently crashed about from houses in Olsberg according to a witness.
Split into simpler sentences: Two Eurofighter Typhoons were on exercise with the Learjet in the Elpe-Olsberg area when one of them hit the Learjet. The Learjet consequently crashed about from houses in Olsberg according to a witness.