Complex sentence: Nkunku made his professional debut on 8 December 2015 in the UEFA Champions League against Shakhtar Donetsk replacing Lucas Moura after 87 minutes in a 2--0 home win.
Split into simpler sentences: Nkunku made his professional debut on 8 December 2015 in the UEFA Champions League against Shakhtar Donetsk. He replaced Lucas Moura after 87 minutes in a 2--0 home win.