  Soliton molecules have been experimentally discovered in optics and
theoretically investigated for coupled systems. This paper is concerned with
the formation of soliton molecules by the resonant mechanism for a noncoupled
system, the Sharma-Tasso-Olver-Burgers (STOB) equation. In terms of introducing
velocity resonance conditions, we derive the soliton (kink) molecules, half
periodic kink (HPK) molecules and breathing soliton molecule of STOB equation.
Meanwhile, the fission and fusion phenomena among kinks, kink molecules, HPKs
and HPK molecules have been revealed. Moreover, we also discuss the central
periodic kink solutions from the multiple solitary wave solutions.
