Complex sentence: In the fourth generation, a second ability called Strong Luck is introduced to Absol and the Murkrow evolution line; this allows the bearer to score a higher amount of critical hits on other Pokémon.
Split into simpler sentences: In the fourth generation, a second ability called Strong Luck is introduced to Absol and the Murkrow evolution line. Absol (and the Murkrow line) are able to score a higher amount of critical hits on other Pokémon.