Complex sentence: He scored his first goal of the season with a screamer in a 2--2 away draw against Borussia Mönchengladbach, later suffering a serious injury that left him out of action for several months.
Split into simpler sentences: He scored his first goal of the season with a screamer in a 2--2 away draw against Borussia Mönchengladbach. He then had a serious injury that left him out of action for several months.