American Equity Investment Life Holding Co. has renewed an offering of senior notes that it abruptly canceled last month, increasing the amount of debt it seeks to issue to $400 million. In a press release Thursday, the West Des Moines-based annuity company announced it plans to use the proceeds of the offering to raise cash to redeem two previously issued rounds of senior notes. American Equity had canceled a previously announced $250 million offering on June 21, citing unfavorable market conditions at that time.