How to automate the clean-up of the AutoCAD data in ArcMap 10.2?

[OlesiaBaklanova]

We are working on a school project where the electrical (primary, secondary lines etc.) data has been transported from AutoCAD into ArcMap. However, the data needs to be cleaned-up before we run the topology on it and create the network: all the parts of the primary/secondary lines need to be connected with no gaps.

When we used Extent tool, some of the issues were fixed. Later we applied Snap tool that broke fixed lines.

Is there any other ways to simplify and automate this process?

The pictures below are of the original data (the primary lines  in red color, secondary in brown).

Thank you for your help!