说 + (了) + 谎
说谎 (shuōhuǎng) is a separable verb meaning "to tell a lie" or "to lie." Because it is separable, other elements such as 了 or aspect markers can be inserted between 说 and 谎. For example, 说了谎 means "told a lie," and the verb can be split in various grammatical constructions.
小孩子不应该说谎。
Xiǎo háizi bù yīnggāi shuōhuǎng.
Children shouldn't tell lies.
他说了一个很大的谎,被大家发现了。
Tā shuōle yī gè hěn dà de huǎng, bèi dàjiā fāxiàn le.
He told a big lie and was found out by everyone.
她从来没有说过谎,是个诚实的人。
Tā cónglái méiyǒu shuōguò huǎng, shì gè chéngshí de rén.
She has never told a lie; she is an honest person.