sentences:  He was one of the founder members of the Democratic Action Party (DAP), and served as the party's chairman from 1965 to 1977.However, he left DAP after a bitter power struggle with the then secretary general Lim Kit Siang and co-founded two minor political parties, the Social Democratic Party (SDP) in 1978 and the Malaysian Democratic Party (MDP) in 1999.Yeap was well known for his aggressiveness, uncompromising stance and remarkable oratory skill.