Complex sentence: In his first month, he managed to score twice in the league and another two in the club's European campaign, although he has showed dissapointing form in the league, with only 4 goals in 18 matches.
Split into simpler sentences: In his first month, he managed to score twice in the league and another two in the club's European campaign. Recently he has showed dissapointing form in the league, with only 4 goals in 18 matches.