To take in; to gather in; to mingle, blend or merge.
To cause or engage (someone or something) to participate or to become connected or implicated.
To comprise or include; to have as a related part.
To complicate or make intricate.
To envelop, enfold, entangle.
To become simpler.
To make simpler, either by reducing in complexity, reducing to component parts, or making easier to understand.