Complex sentence: On 23 April, they lost to Bayern Munich 0--4, their biggest defeat in Europe in 16 years, On 1 May, they lost 0-3 again, they were knocked out in the Champions League semi-final.
Split into simpler sentences: On 23 April, they lost to Bayern Munich 0--4, their biggest defeat in Europe in 16 years, On 1 May, they lost 0-3 again. With an aggregate score of 0--7, they were knocked out in the Champions League semi-final.