Hello,
Thank you very much for choosing our theme and contacting us.
The full-width element is created by a row settings: http://prntscr.com/kij8n3
Create a row with two columns and insert text into one, and Promo banner into another https://gyazo.com/a3816e38908e51bf881df9e0de6c814d
Put the element in vice versa order in the second row. Take into consideration margins and paddings, go to the Design tab of the element/row/column and set zero.
Here is the demo of timeline element: https://demo.xtemos.com/basel/timeline/
Best Regards