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It was planted within the urban area of Pamplona, Navarre, in Spain. It does not seem like it's native to the area, since no trees like it are found in nearby forests. Its size is of 7-9 meters, while its leaves were commonly 4-5 cm long. It was spring when these photos were taken. It had a great number of tiny, dark flowers. It also showed tumor-like growths where the trunk begins to branch.

Upper portion

Trunk

[Branch[5]

Flowers

Leaf

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I believe you are looking at Box Elder, Acer negundo. It's a North American species but according to Wikipedia it is naturalized in Europe. If you search online for images, you will see the leaves and flower structures in your own pictures. Specimens I have seen in my area (Indiana, USA) are very similar to your pictures, even identical, and the trunk is gnarly, as you observed.

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  • $\begingroup$ Nice identification, +1. There's a picture here if you want it. $\endgroup$
    – anongoodnurse
    Commented Apr 3, 2019 at 1:20
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    $\begingroup$ Thanks. After Googleing it, it seems to be the male plant (landscapeplants.oregonstate.edu/plants/acer-negundo). $\endgroup$
    – user38945
    Commented Apr 3, 2019 at 15:17
  • $\begingroup$ Interesting... I did not know or did not remember it is dioecous. $\endgroup$
    – Bryan Hanson
    Commented Apr 5, 2019 at 0:40

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