Complex sentence: Under influence of alcohol (he tippled much and often) his traits appeared to rase in to its extreme, his humour became lousy and nasty and although he never provoked physical conflicts as a rule, he never prevent them.
Split into simpler sentences: Under influence of alcohol (he tippled much and often) his traits appeared to raise extremely. His humour became lousy and nasty and although he never provoked physical conflicts as a rule, he never prevent them.