Original sentence: However, most of these polls had a high margin of error (plus or minus three percent) and only showed Yabloko obtaining seats by a tiny margin.It is argued that the vote-count in the 2003 Russian parliamentary election was marred by fraud.Official results announced by the Central Election Commission gave Yabloko 4.30% of the vote and no seats on the proportional party-list system
Edited sentence: However, official results announced by the Central Election Commission gave Yabloko 4.30% of the vote and no seats on the proportional party-list system.It is widely believed that the vote-count in the 2003 Russian parliamentary election was marred by fraud