For renders the Hebrew waw conjunction. Here it introduces how the Israelites insulted God in Canaan by their unfaithfulness.

When I had brought them into the land which I swore to give them: See Ezek 20.6.

Then wherever they saw any high hill or any leafy tree …: A high hill or a leafy tree easily became a center of idol worship for the Israelites in Canaan (compare 6.13). The rest of the verse describes four acts of pagan worship that the people did in the shrines on the hills or under the sacred trees. God stresses that the people worshiped at these pagan shrines by beginning each act with an emphatic there, although Revised Standard Version retains only three of them as follows:

(1) There they offered their sacrifices means they killed animals and burned them as food for the false gods.
(2) And [there they] presented the provocation of their offering means they brought gifts or offerings to the idols, which made God angry. The Hebrew noun for provocation refers to an action that causes someone to become angry (see 8.17, where the verb from the same root is rendered “provoke … to anger”). This clause may be rendered “and there they provoked my anger [or, they made me angry] by giving offerings to the false gods.”
(3) There they sent up their soothing odors means they burned sacrifices and sweet-smelling incense so that the smoke rose up into the sky and the false gods smelled it and were pleased (see the comments on 6.13 and 16.19). Translators may say “there they burned sacrifices to please the false gods.”
(4) And there they poured out their drink offerings means they brought liquids that could be drunk and gave them to the false gods, probably by pouring them out on altars. Usually the drink offerings were wine (so Good News Translation, Contemporary English Version). Often the worshipers drank them as well, as a way of sharing them with the gods. These drink offerings are also called “libations” (Jerusalem Bible/New Jerusalem Bible, New Jewish Publication Society’s Tanakh). This clause may be rendered “and there they poured drinks on altars for the gods.”

It may help readers if translators break this verse into several sentences. One model that does this is:

• For when I led them into the land that I had promised to give them, they began to worship false gods wherever they saw a high hill or a leafy tree. In those places they killed animals and burned them as a sacrifice for the gods. In those places they made me angry by giving offerings to the gods. In those places they burned sacrifices to please the gods. In those places they poured drinks on altars for the gods.

Quoted with permission from Gross, Carl & Stine, Philip C. A Handbook on Ezekiel. (UBS Helps for Translators). Miami: UBS, 2016. For this and other handbooks for translators see here .