Complex sentence: She gets a thrill out of the mere act of gambling, and can quickly figure out ways that the games are being manipulated in her opponents' favor, and can more often than not turn the tables on her foes.
Split into simpler sentences: She gets a thrill out of the mere act of gambling, and can quickly figure out ways that the games are being manipulated in her opponents' favor. Yumeko can more often than not turn the tables on her foes.