Complex sentence: While the attack was in progress, a youth climbed over the wall which surrounded the yard area coming face-to-face with Des Taviner, in the resulting scuffle Taviner seized the youths petrol bombs but let him get away.
Split into simpler sentences: While the attack was in progress, a youth climbed over the wall which surrounded the yard area, coming face to face with Des Taviner. In the resulting scuffle Taviner seized the youth's petrol bombs, but let him get away.