Individual clips can be seen more clearly by expanding the timeline. Use the slider at the left-bottom of the window... 
Clips in the bin (top-left) can be dragged to the timeline, one after another.
Drag.mp4 Or right-click the bin clip and choose a placement.
If this doesn't answer your question, please post a screen shot of the 'bunched up' clips. Save the screen grab to a file, then upload the file to a free server, such as Google Drive or MS OneDrive, right-click the link and Share or Copy. Copy the result and paste it here or to me in a Private Message via the mail envelope in the top-right corner of this forum. When using Google Drive, click SHARE | SHARE and change "restricted" to "anyone with link can view.**