We propose and demonstrate an intrachannel fiber nonlinear impairments compensation scheme based on the transformer and simplified triplets. In comprehensive numerical experiments with a transmission distance of 1200 km for 30-GBaud dual-polarization 16-ary quadrature amplitude modulation signals, the Q factor gains of the proposed scheme are 2.48, 1.73, 0.98, and 0.31 dB compared to chromatic dispersion compensation, digital back propagation using 1-steps-per-span split-step Fourier method (1-StSp DBP), deep neural network (DNN), and 10-StSp DBP, respectively. The implementation complexity of the proposed scheme is reduced by 65% and 43% compared to 10-StSp DBP and DNN, respectively.