Complex sentence: It is also possible for archaeological layers to be reworked on purpose or by accident (by humans, natural forces or animals), for example in a tell mound where layers are not typically uniform or horizontal or in land cleared or tilled for farming.
Split into simpler sentences: It is also possible for archaeological layers to be reworked on purpose or by accident (by humans, natural forces or animals). For example, in a "tell-tell mound", where layers are not typically uniform or horizontal, or in land cleared or tilled for farming.